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From "Lukas Eder (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-5466) Add support for SQL Standard statistics functions, such as STDDEV_POP, STDDEV_SAMP, VAR_POP, VAR_SAMP
Date Sun, 16 Oct 2011 12:00:12 GMT
Add support for SQL Standard statistics functions, such as STDDEV_POP, STDDEV_SAMP, VAR_POP,
VAR_SAMP
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                 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


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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