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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