Can I use… window clause


Apache DerbyBigQueryDb2 (LUW)H2MariaDBMySQLOracle DBPostgreSQLSQL ServerSQLite2009201120132015201720192021✓ 3.25.0+⊘ 3.5.7 - 3.23.1✓ 2022+⊘ 2008R2 - 2019✓ 8.4+⊘ 8.3✓ 21c+⊘ 11gR1 - 19c✓ 8.0.11+⊘ 5.0 - 5.7✓ 10.2+⊘ 5.1 - 10.1✓ 1.4.198+⊘ 1.4.191 - 1.4.197⊘ 9.7 - 11.5.8✓ 2.0+⊘ 10.15.1.3 - 10.16.1.1

The window clause allows to centralize and reuse window definitions. It is the last clause of <table expression>—i.e. it follows the having clause if present.

 SELECT MIN(x) OVER window_name
      , MAX(x) OVER window_name
   FROM …
[ WHERE …    ]
[ GROUP BY … ]
[HAVING …    ]
 WINDOW window_name AS ([PARTITION BY …] [ORDER BY …] …) 

Both window functions, min and max, use the same window definition.

Normative References

The window clause is defined in ISO/IEC 9075:2016-2 as part of optional feature T612, “Advanced OLAP operations”.

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