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https://issues.apache.org/jira/browse/DERBY-5466?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Scott Lewis updated DERBY-5466:
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Attachment: DERBY.5466.aggtest.patch
This attachment now contains tests for var_pop, var_samp, stddev_pop, and
stddev_samp statistical functions added via previous contribution. With
latest of everything, these tests are passing, with the results consistent with
the associated function from Excel and data entered in to spreadsheet.
> Add support for SQL Standard statistics functions, such as STDDEV_POP,
> STDDEV_SAMP, VAR_POP, VAR_SAMP
> -----------------------------------------------------------------------------------------------------
>
> Key: DERBY-5466
> URL: https://issues.apache.org/jira/browse/DERBY-5466
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.8.1.2
> Reporter: Lukas Eder
> Priority: Minor
> Labels: derby_triage10_10
> Attachments: DERBY-5466.stats.patch, DERBY.5466.aggtest.patch,
> derby-5466-01-aa-aggregatorClasses.diff, derby-5466-02-aa-bindLogic.diff,
> derby-5466-02-ab-bindLogic.diff, derby-5466-03-aa-distinctError.diff,
> var_pop_formulas.txt
>
>
> Any of these RDBMS support the SQL standard statistics functions STDDEV_POP,
> STDDEV_SAMP, VAR_POP, VAR_SAMP:
> - DB2 (only STDDEV, VARIANE)
> - H2
> - HSQLDB
> - Ingres
> - MySQL
> - Oracle
> - Postgres
> - SQL Server (named STDEVP, STDEV, VARP, VAR)
> - Sybase ASE
> - Sybase SQL Anywhere
> These don't:
> - Derby
> - SQLite
> This would be a useful addition for Derby, I think.
> An even larger example list of possible statistics aggregate functions is
> listed in the Postgres documentation:
> http://www.postgresql.org/docs/9.0/static/functions-aggregate.html#FUNCTIONS-AGGREGATE-STATISTICS-TABLE
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