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Supporting grouping sets

Grouping sets are essential to generate more than just one aggregation in a single query. The following list shows which engines support grouping sets and which don't:

MariaDB: Only ROLLUP clause is supported since 5.1 (incomplete support)
MySQL: Only ROLLUP clause is supported since 5.0 (incomplete support)
PostgreSQL: Supported since PostgreSQL 9.5
SQLite: Not supported
Db2 LUW: Supported since at least 1999
Oracle: Supported since 9iR1 (around 2000)
Microsoft SQL Server: Supported since 2008

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