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Maksim Kita 2024-04-13 18:48:38 +03:00
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docs/en/sql-reference/statements/select/index.md
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@ -21,6 +21,8 @@ SELECT [DISTINCT [ON (column1, column2, ...)]] expr_list
[WHERE expr] [WHERE expr]
[GROUP BY expr_list] [WITH ROLLUP|WITH CUBE] [WITH TOTALS] [GROUP BY expr_list] [WITH ROLLUP|WITH CUBE] [WITH TOTALS]
[HAVING expr] [HAVING expr]
[WINDOW window_expr_list]
[QUALIFY expr]
[ORDER BY expr_list] [WITH FILL] [FROM expr] [TO expr] [STEP expr] [INTERPOLATE [(expr_list)]] [ORDER BY expr_list] [WITH FILL] [FROM expr] [TO expr] [STEP expr] [INTERPOLATE [(expr_list)]]
[LIMIT [offset_value, ]n BY columns] [LIMIT [offset_value, ]n BY columns]
[LIMIT [n, ]m] [WITH TIES] [LIMIT [n, ]m] [WITH TIES]
@ -45,6 +47,7 @@ Specifics of each optional clause are covered in separate sections, which are li
- [GROUP BY clause](../../../sql-reference/statements/select/group-by.md) - [GROUP BY clause](../../../sql-reference/statements/select/group-by.md)
- [LIMIT BY clause](../../../sql-reference/statements/select/limit-by.md) - [LIMIT BY clause](../../../sql-reference/statements/select/limit-by.md)
- [HAVING clause](../../../sql-reference/statements/select/having.md) - [HAVING clause](../../../sql-reference/statements/select/having.md)
- [QUALIFY clause](../../../sql-reference/statements/select/qualify.md)
- [LIMIT clause](../../../sql-reference/statements/select/limit.md) - [LIMIT clause](../../../sql-reference/statements/select/limit.md)
- [OFFSET clause](../../../sql-reference/statements/select/offset.md) - [OFFSET clause](../../../sql-reference/statements/select/offset.md)
- [UNION clause](../../../sql-reference/statements/select/union.md) - [UNION clause](../../../sql-reference/statements/select/union.md)

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docs/en/sql-reference/statements/select/qualify.md Normal file
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---
slug: /en/sql-reference/statements/select/qualify
sidebar_label: QUALIFY
---
# QUALIFY Clause
Allows filtering window functions results. It is similar to the [WHERE](../../../sql-reference/statements/select/where.md) clause, but the difference is that `WHERE` is performed before window functions evaluation, while `QUALIFY` is performed after it.
It is possible to reference window functions results from `SELECT` clause in `QUALIFY` clause by their alias. Alternatively, `QUALIFY` clause can filter on results of additional window functions that are not returned in query results.
## Limitations
`QUALIFY` can’t be used if there are no window functions to evaluate. Use `WHERE` instead.