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href="/drill/docs/lesson-2-run-queries-with-ansi-sql/">Lesson 2: Run Queries
with ANSI SQL</a></li>
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+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/lesson-3-run-queries-on-complex-data-types/">Lesson 3: Run
Queries on Complex Data Types</a></li>
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+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/summary/">Summary</a></li>
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+ </ul>
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href="/drill/docs/analyzing-highly-dynamic-datasets/">Analyzing Highly Dynamic
Datasets</a></li>
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href="/drill/docs/analyzing-social-media/">Analyzing Social Media</a></li>
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href="/drill/docs/analyzing-data-using-window-functions/">Analyzing Data Using
Window Functions</a></li>
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Introduction</a></li>
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+ <li class="toctree-l2"><a href="javascript: void(0);">Installing
Drill in Embedded Mode</a></li>
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+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/embedded-mode-prerequisites/">Embedded Mode
Prerequisites</a></li>
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href="/drill/docs/installing-drill-on-linux-and-mac-os-x/">Installing Drill on
Linux and Mac OS X</a></li>
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+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/starting-drill-on-linux-and-mac-os-x/">Starting Drill on
Linux and Mac OS X</a></li>
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+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/installing-drill-on-windows/">Installing Drill on
Windows</a></li>
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href="/drill/docs/starting-drill-on-windows/">Starting Drill on Windows</a></li>
+
+ </ul>
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+
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+ <li class="toctree-l2"><a href="javascript: void(0);">Installing
Drill in Distributed Mode</a></li>
+ <ul style="display: none">
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+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/distributed-mode-prerequisites/">Distributed Mode
Prerequisites</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/installing-drill-on-the-cluster/">Installing Drill on the
Cluster</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/starting-drill-in-distributed-mode/">Starting Drill in
Distributed Mode</a></li>
+
+ </ul>
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+
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+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/starting-the-web-console/">Starting the Web Console</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Configure
Drill</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/configure-drill-introduction/">Configure Drill
Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/configuring-drill-memory/">Configuring Drill Memory</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript:
void(0);">Configuring a Multitenant Cluster</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/configuring-a-multitenant-cluster-introduction/">Configuring
a Multitenant Cluster Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/configuring-multitenant-resources/">Configuring Multitenant
Resources</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/configuring-resources-for-a-shared-drillbit/">Configuring
Resources for a Shared Drillbit</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/configuring-user-impersonation/">Configuring User
Impersonation</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/configuring-user-authentication/">Configuring User
Authentication</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/configuring-user-impersonation-with-hive-authorization/">Configuring
User Impersonation with Hive Authorization</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/configuring-web-console-and-rest-api-security/">Configuring
Web Console and REST API Security</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript:
void(0);">Configuration Options</a></li>
+ <ul style="display: none">
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+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/configuration-options-introduction/">Configuration Options
Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/start-up-options/">Start-Up Options</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/planning-and-execution-options/">Planning and Execution
Options</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/persistent-configuration-storage/">Persistent Configuration
Storage</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/ports-used-by-drill/">Ports Used by Drill</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/configuring-the-drill-shell/">Configuring the Drill
Shell</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Connect a Data
Source</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/connect-a-data-source-introduction/">Connect a Data Source
Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/storage-plugin-registration/">Storage Plugin
Registration</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Storage
Plugin Configuration</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/plugin-configuration-basics/">Plugin Configuration
Basics</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/workspaces/">Workspaces</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/drill-default-input-format/">Drill Default Input
Format</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/file-system-storage-plugin/">File System Storage
Plugin</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/hbase-storage-plugin/">HBase Storage Plugin</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/hive-storage-plugin/">Hive Storage Plugin</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/rdbms-storage-plugin/">RDBMS Storage Plugin</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/mongodb-storage-plugin/">MongoDB Storage Plugin</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/mapr-db-format/">MapR-DB Format</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/s3-storage-plugin/">S3 Storage Plugin</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1 current_section "><a href="javascript:
void(0);">ODBC/JDBC Interfaces</a></li>
+ <ul class="current_section">
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/interfaces-introduction/">Interfaces Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/using-the-jdbc-driver/">Using the JDBC Driver</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/using-jdbc-with-squirrel-on-windows/">Using JDBC with
SQuirreL on Windows</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Installing
the ODBC Driver</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/installing-the-driver-on-linux/">Installing the Driver on
Linux</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/installing-the-driver-on-mac-os-x/">Installing the Driver on
Mac OS X</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/installing-the-driver-on-windows/">Installing the Driver on
Windows</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/installing-the-tdc-file-on-windows/">Installing the TDC File
on Windows</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript:
void(0);">Configuring ODBC</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/odbc-configuration-reference/">ODBC Configuration
Reference</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/configuring-odbc-on-linux/">Configuring ODBC on Linux</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/configuring-odbc-on-mac-os-x/">Configuring ODBC on Mac OS
X</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/configuring-odbc-on-windows/">Configuring ODBC on
Windows</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/testing-the-odbc-connection/">Testing the ODBC
Connection</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Using
Drill Explorer</a></li>
+ <ul style="">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/drill-explorer-introduction/">Drill Explorer
Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/connecting-drill-explorer-to-data/">Connecting Drill Explorer
to Data</a></li>
+
+ <li class="toctree-l3 current"><a class="reference internal"
href="/drill/docs/browsing-data-and-defining-views/">Browsing Data and Defining
Views</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Using
Drill with BI Tools</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/using-drill-with-bi-tools-introduction/">Using Drill with BI
Tools Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/tableau-examples/">Tableau Examples</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/using-microstrategy-analytics-with-apache-drill/">Using
MicroStrategy Analytics with Apache Drill</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/using-tibco-spotfire-desktop-with-drill/">Using Tibco
Spotfire Desktop with Drill</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/configuring-tibco-spotfire-server-with-drill/">Configuring
Tibco Spotfire Server with Drill</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/using-qlik-sense-with-drill/">Using Qlik Sense with
Drill</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/using-apache-drill-with-tableau-9-desktop/">Using Apache
Drill with Tableau 9 Desktop</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/using-apache-drill-with-tableau-9-server/">Using Apache Drill
with Tableau 9 Server</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/configuring-jreport-with-drill/">Configuring JReport with
Drill</a></li>
+
+ </ul>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Query
Data</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/query-data-introduction/">Query Data Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Querying a
File System</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/querying-a-file-system-introduction/">Querying a File System
Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/querying-json-files/">Querying JSON Files</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/querying-parquet-files/">Querying Parquet Files</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/querying-plain-text-files/">Querying Plain Text Files</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/querying-directories/">Querying Directories</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/querying-sequence-files/">Querying Sequence Files</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/querying-hbase/">Querying HBase</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Querying
Complex Data</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/querying-complex-data-introduction/">Querying Complex Data
Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/sample-data-donuts/">Sample Data: Donuts</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/selecting-flat-data/">Selecting Flat Data</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/using-sql-functions-clauses-and-joins/">Using SQL Functions,
Clauses, and Joins</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/selecting-nested-data-for-a-column/">Selecting Nested Data
for a Column</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/selecting-multiple-columns-within-nested-data/">Selecting
Multiple Columns Within Nested Data</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/querying-hive/">Querying Hive</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/querying-the-information-schema/">Querying the INFORMATION
SCHEMA</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/querying-system-tables/">Querying System Tables</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/monitoring-and-canceling-queries-in-the-drill-web-console/">Monitoring
and Canceling Queries in the Drill Web Console</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Performance
Tuning</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/performance-tuning-introduction/">Performance Tuning
Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/partition-pruning/">Partition Pruning</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/optimizing-parquet-metadata-reading/">Optimizing Parquet
Metadata Reading</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/choosing-a-storage-format/">Choosing a Storage Format</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Query
Plans and Tuning</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/query-plans-and-tuning-introduction/">Query Plans and Tuning
Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/join-planning-guidelines/">Join Planning Guidelines</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/guidelines-for-optimizing-aggregation/">Guidelines for
Optimizing Aggregation</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/modifying-query-planning-options/">Modifying Query Planning
Options</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/sort-based-and-hash-based-memory-constrained-operators/">Sort-Based
and Hash-Based Memory-Constrained Operators</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/enabling-query-queuing/">Enabling Query Queuing</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/controlling-parallelization-to-balance-performance-with-multi-tenancy/">Controlling
Parallelization to Balance Performance with Multi-Tenancy</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript:
void(0);">Identifying Performance Issues</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/query-plans/">Query Plans</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/query-profiles/">Query Profiles</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript:
void(0);">Performance Tuning Reference</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/query-profile-column-descriptions/">Query Profile Column
Descriptions</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/physical-operators/">Physical Operators</a></li>
+
+ </ul>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Log and
Debug</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/log-and-debug-introduction/">Log and Debug
Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/error-messages/">Error Messages</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/modify-logback-xml/">Modify logback.xml</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/review-the-java-stack-trace/">Review the Java Stack
Trace</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/query-audit-logging/">Query Audit Logging</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">SQL
Reference</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/sql-reference-introduction/">SQL Reference
Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Data
Types</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/supported-data-types/">Supported Data Types</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/date-time-and-timestamp/">Date, Time, and Timestamp</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/handling-different-data-types/">Handling Different Data
Types</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/lexical-structure/">Lexical Structure</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/operators/">Operators</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">SQL
Functions</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/about-sql-function-examples/">About SQL Function
Examples</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/math-and-trig/">Math and Trig</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/data-type-conversion/">Data Type Conversion</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/date-time-functions-and-arithmetic/">Date/Time Functions and
Arithmetic</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/string-manipulation/">String Manipulation</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/aggregate-and-aggregate-statistical/">Aggregate and Aggregate
Statistical</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/functions-for-handling-nulls/">Functions for Handling
Nulls</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">SQL Window
Functions</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/sql-window-functions-introduction/">SQL Window Functions
Introduction</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/aggregate-window-functions/">Aggregate Window
Functions</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/ranking-window-functions/">Ranking Window Functions</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/value-window-functions/">Value Window Functions</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/sql-window-functions-examples/">SQL Window Functions
Examples</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Nested
Data Functions</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/nested-data-limitations/">Nested Data Limitations</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/flatten/">FLATTEN</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/kvgen/">KVGEN</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/repeated-count/">REPEATED_COUNT</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/repeated-contains/">REPEATED_CONTAINS</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/query-directory-functions/">Query Directory Functions</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">SQL
Commands</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/supported-sql-commands/">Supported SQL Commands</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/alter-session/">ALTER SESSION</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/alter-system/">ALTER SYSTEM</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/create-table-as-ctas/">CREATE TABLE AS (CTAS)</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/partition-by-clause/">PARTITION BY Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/create-view/">CREATE VIEW</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/describe/">DESCRIBE</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/drop-table/">DROP TABLE</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/drop-view/">DROP VIEW</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/explain/">EXPLAIN</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/select/">SELECT</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/select-list/">SELECT List</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/from-clause/">FROM Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/group-by-clause/">GROUP BY Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/having-clause/">HAVING Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/limit-clause/">LIMIT Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/offset-clause/">OFFSET Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/order-by-clause/">ORDER BY Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/union-set-operator/">UNION Set Operator</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/where-clause/">WHERE Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/with-clause/">WITH Clause</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/show-databases-and-show-schemas/">SHOW DATABASES and SHOW
SCHEMAS</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/show-files/">SHOW FILES</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/show-tables/">SHOW TABLES</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/use/">USE</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">SQL
Conditional Expressions</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/case/">CASE</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/reserved-keywords/">Reserved Keywords</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/sql-extensions/">SQL Extensions</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Data Sources
and File Formats</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/data-sources-and-file-formats-introduction/">Data Sources and
File Formats Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/hive-to-drill-data-type-mapping/">Hive-to-Drill Data Type
Mapping</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/deploying-and-using-a-hive-udf/">Deploying and Using a Hive
UDF</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/parquet-format/">Parquet Format</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/json-data-model/">JSON Data Model</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/text-files-csv-tsv-psv/">Text Files: CSV, TSV, PSV</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/sequence-files/">Sequence Files</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Develop Custom
Functions</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/develop-custom-functions-introduction/">Develop Custom
Functions Introduction</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/developing-a-simple-function/">Developing a Simple
Function</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/tutorial-develop-a-simple-function/">Tutorial: Develop a
Simple Function</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/developing-an-aggregate-function/">Developing an Aggregate
Function</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/adding-custom-functions-to-drill/">Adding Custom Functions to
Drill</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/using-custom-functions-in-queries/">Using Custom Functions in
Queries</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/custom-function-interfaces/">Custom Function
Interfaces</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a class="reference internal"
href="/drill/docs/troubleshooting/">Troubleshooting</a></li>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Developer
Information</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/rest-api/">REST API</a></li>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Develop
Drill</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/compiling-drill-from-source/">Compiling Drill from
Source</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/drill-patch-review-tool/">Drill Patch Review Tool</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Contribute
to Drill</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/apache-drill-contribution-guidelines/">Apache Drill
Contribution Guidelines</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/apache-drill-contribution-ideas/">Apache Drill Contribution
Ideas</a></li>
+
+ </ul>
+
+
+
+ <li class="toctree-l2"><a href="javascript: void(0);">Design
Docs</a></li>
+ <ul style="display: none">
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/drill-plan-syntax/">Drill Plan Syntax</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/rpc-overview/">RPC Overview</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/query-stages/">Query Stages</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/useful-research/">Useful Research</a></li>
+
+ <li class="toctree-l3"><a class="reference internal"
href="/drill/docs/value-vectors/">Value Vectors</a></li>
+
+ </ul>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Release
Notes</a></li>
+ <ul style="display: none">
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-1-3-0-release-notes/">Apache Drill 1.3.0 Release
Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-1-2-0-release-notes/">Apache Drill 1.2.0 Release
Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-1-1-0-release-notes/">Apache Drill 1.1.0 Release
Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-1-0-0-release-notes/">Apache Drill 1.0.0 Release
Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-0-9-0-release-notes/">Apache Drill 0.9.0 Release
Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-0-8-0-release-notes/">Apache Drill 0.8.0 Release
Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-0-7-0-release-notes/">Apache Drill 0.7.0 Release
Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-0-6-0-release-notes/">Apache Drill 0.6.0 Release
Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache
Drill M1 Release Notes (Apache Drill Alpha)</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-m1-release-notes-apache-drill-alpha/">Apache
Drill M1 Release Notes (Apache Drill Alpha)</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-0-5-0-release-notes/">Apache Drill 0.5.0 Release
Notes</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/apache-drill-0-4-0-release-notes/">Apache Drill 0.4.0 Release
Notes</a></li>
+
+
+ </ul>
+
+
+
+ <li class="toctree-l1"><a href="javascript: void(0);">Sample
Datasets</a></li>
+ <ul style="display: none">
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+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/aol-search/">AOL Search</a></li>
+
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+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/enron-emails/">Enron Emails</a></li>
+
+
+
+ <li class="toctree-l2"><a class="reference internal"
href="/drill/docs/wikipedia-edit-history/">Wikipedia Edit History</a></li>
+
+
+ </ul>
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+ <li class="toctree-l1"><a class="reference internal"
href="/drill/docs/project-bylaws/">Project Bylaws</a></li>
+
+
+ </ul>
+
+ </div>
+ </div>
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+
+ <a class="edit-link"
href="https://github.com/apache/drill/blob/gh-pages/_docs/odbc-jdbc-interfaces/using-drill-explorer/030-browsing-data-and-creating-views.md";
target="_blank"><i class="fa fa-pencil-square-o"></i></a>
+
+
+ <div class="int_title left">
+ <h1>Browsing Data and Defining Views</h1>
+
+ </div>
+
+ <link href="/drill/css/docpage.css" rel="stylesheet" type="text/css">
+
+ <div class="int_text" align="left">
+
+ <p>After connecting Drill Explorer to data, the Browse and SQL tabs
appear on the right side of the console. On the Browse tab, you view any
metadata that might exist for a schema that you access with Drill. On the SQL
tab, you preview the results
+of custom queries and save the results as a view.</p>
+
+<h2 id="browsing-data">Browsing Data</h2>
+
+<p>You can browse files and directories if you have permission to read them.
In the Schemas pane, you expand branches until you find the file or table you
want to view, and then select it. </p>
+
+<p>Tip: To avoid error messages, which you can ignore, expand directories
carefully by clicking on the arrow instead of the directory name until you find
valid data. </p>
+
+<p>In the Browse tab, the Metadata pane displays the structure, if there is
any, of the selected table or file. The Preview pane displays the actual data.
The SQL tab displays the statement that returns the data you see in the Browse
tab.</p>
+
+<p>To update data after making changes in the data source, right-click a file,
table, view, schema, or directory in the Schemas pane, and select Refresh. The
scope of the update is limited to the item you right-click.</p>
+
+<p>The following example shows how to browse data using the sample MapR ODBC
Driver DSN.</p>
+
+<ol>
+<li>Start Drill if necessary.<br></li>
+<li>Start Drill Explorer and connect to the sample DSN.<br></li>
+<li>In the <strong>Schemas</strong> pane of Drill Explorer, on the
<strong>Browse</strong> tab, navigate to the <code>sample-data</code> directory
in the dfs.default schema. Click <code>nation.parquet</code>.<br>
+The data from <code>nation.parquet</code> appears in the Preview pane.
+<img src="/drill/docs/img/explorer-nation-data.png" alt="nation parquet"> </li>
+</ol>
+
+<h2 id="defining-a-view">Defining a View</h2>
+
+<p>After browsing data, you can define, preview, and save a view of file-based
data. On the SQL tab, modify the statement in View Definition SQL to select the
data you want to view. Click <strong>Create As</strong> to navigate to the
location for saving the view. You need to save the view to a location that you
define as <code>writable</code> in the storage plugin definition. After saving
a view, a message is displayed about the status of the operation. Click
<strong>Copy</strong> to copy the message.</p>
+
+<p>The following example defines and saves a view of a few columns of
<code>nation.parquet</code> data.</p>
+
+<ol>
+<li>Start Drill.<br></li>
+<li>Start Drill Explorer and connect to the sample DSN.<br></li>
+<li>In the <strong>Schemas</strong> section on the <strong>Browse</strong>
tab, navigate to the <code>/sample-data/nation.parquet</code> in the
<code>dfs.default</code> schema. </li>
+<li><p>On the <strong>SQL</strong> tab, in the <strong>View Definition
SQL</strong> field, enter a query, as described in the <a href="">Specifying
Column Names</a>. For example, modify the SELECT statement as follows:</p>
+<div class="highlight"><pre><code class="language-text"
data-lang="text">SELECT N_NAME, N_REGIONKEY FROM
`dfs.default`.`./Users/drilluser/drill/sample-data/nation.parquet` WHERE
N_REGIONKEY IN (2, 4)
+</code></pre></div>
+<p>Do not put a semicolon at the end of the SQL statement. </p></li>
+<li><p>Click <strong>Preview</strong>.
+<img src="/drill/docs/img/odbc-define-view.png" alt="nation parquet"> </p></li>
+<li><p>Click <strong>Create As</strong>.<br>
+The <em>Create As</em> dialog is displayed.
+<img src="/drill/docs/img/odbc-create-as.png" alt="nation parquet"> </p></li>
+<li><p>From the list of schemas, select the schema that defines the location
for saving the view. For example, accept the <a
href="/drill/docs/query-directory-functions/#query-directory-function-example">dfs.tmp</a>
schema because the default <code>dfs</code> storage plugin defines the
<code>tmp</code> directory as writable.
+You can save views only to file-based schemas. </p></li>
+<li><p>In <strong>View Name</strong>, enter a name for the view.<br>
+Do not include spaces in the view name. </p></li>
+<li><p>Click <strong>Save</strong> and check <strong>Overwrite Existing
Views</strong> if you want to save over an existing view.<br>
+The status message associated appears. </p></li>
+<li><p>Click <strong>Close</strong>.</p></li>
+</ol>
+
+<p>Views that you create using the Drill Explorer do not appear under the
schema
+associated with the data source type. Access the views from
+the file-based schema that you selected when saving the view.</p>
+
+<h2 id="specifying-column-names">Specifying Column Names</h2>
+
+<p>Use of the SQL asterisk (*) selector to return all columns in a table is
limited. Tableau might not connect to your Drill data source successfully using
+the SQL view that Drill Explorer creates. Modify the
+queries generated by Drill Explorer to specify columns to return based on the
following
+syntax guidelines, depending on the schema type or file format.</p>
+
+<p>Specify individual columns when defining a view in Drill Explorer instead
of attempting to select all, as shown in the following examples.</p>
+<div class="highlight"><pre><code class="language-text"
data-lang="text">SELECT CAST(account['name'] AS varchar(20)) FROM
hbase.students
+SELECT CAST(column1 AS varchar(20)) FROM
`dfs`.`default`.`./opt/drill/test.parquet`
+SELECT column1 FROM `dfs`.`default`.`./opt/drill/interval.json`
+</code></pre></div>
+<p>To query nested elements, use the following syntax, where menu is a child
of column1:</p>
+
+<p><code>SELECT column1['menu'] FROM
`dfs`.`default`.`./opt/drill/interval.json</code>`</p>
+
+<p>You can query elements that are multiple levels deep. Continuing the
example, if
+menuitem is a child of menu, then use the following syntax:</p>
+<div class="highlight"><pre><code class="language-text"
data-lang="text">SELECT column1['menu']['menuitem'] FROM
`dfs`.`default`.`./opt/drill/interval.json`
+</code></pre></div>
+<h2 id="casting-data-requirements">Casting Data Requirements</h2>
+
+<p>In SQL statements, you need to cast
+binary data to another format explicitly to view the data. For example, the
following query
+displays results from an HBase database in binary format:<br>
+<code>SELECT account['name'] FROM hbase.students</code></p>
+
+<p>The following query displays the same results in string format:<br>
+<code>SELECT CAST(account['name'] AS varchar(20)) FROM
hbase.students</code></p>
+
+<p>The following query displays results from a Parquet file in binary
format:<br>
+<code>SELECT column1 FROM `dfs`.`default`.`./opt/drill/test.parquet</code>`</p>
+
+<p>The following query displays the same results in string format:</p>
+
+<p><code>SELECT CAST(column1 AS varchar(20)) FROM
`dfs`.`default`.`./opt/drill/test.parquet</code>`</p>
+
+<p>You can also cast the data as other data types, such as integer or date
formats.</p>
+
+
+
+ <div class="doc-nav">
+
+ <span class="previous-toc"><a
href="/drill/docs/connecting-drill-explorer-to-data/">â Connecting Drill
Explorer to Data</a></span><span class="next-toc"><a
href="/drill/docs/using-drill-with-bi-tools/">Using Drill with BI Tools
â</a></span>
+</div>
+
+
+ </div>
+ </div>
+</div>
+
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