Github user hsaputra commented on a diff in the pull request:
https://github.com/apache/tajo/pull/155#discussion_r18195877
--- Diff: tajo-docs/src/main/sphinx/sql_language/queries.rst ---
@@ -23,16 +23,234 @@ Overview
From Clause
=====================
+*Synopsis*
+
+.. code-block:: sql
+
+ [FROM <table reference> [[AS] <table alias name>] [, ...]]
+
+
+The ``FROM`` clause specifies one or more other tables given in a
comma-separated table reference list.
+A table reference can be a relation name , or a subquery, a table join, or
complex combinations of them.
+
+----------------------
+Table and Table Aliase
+----------------------
+
+A temporary name can be given to tables and complex table references to be
used
+for references to the derived table in the rest of the query. This is
called a table alias.
+
+To create a a table alias, please use ``AS``:
+
+.. code-block:: sql
+
+ FROM table_reference AS alias
+
+or
+
+.. code-block:: sql
+
+ FROM table_reference alias
+
+The ``AS`` keyword can be omitted, and *Alias* can be any identifier.
+
+A typical application of table aliases is to give short names to a long
table references. For example:
+
+.. code-block:: sql
+
+ SELECT * FROM long_table_name_1234 s JOIN another_long_table_name_5678 a
ON s.id = a.num;
+
+-------------
+Joined Tables
+-------------
+
+Tajo supports all kinds of join types.
+
+Join Type
--- End diff --
"Join Types" instead of "Join Type" to be consistent with the rest of the
doc.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
