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* prefer relative links from root * wip * split aggregate function reference * split system tables
14 lines
708 B
Markdown
14 lines
708 B
Markdown
---
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toc_title: HAVING
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---
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# HAVING Clause {#having-clause}
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Allows filtering the aggregation results produced by [GROUP BY](../../../sql-reference/statements/select/group-by.md). It is similar to the [WHERE](../../../sql-reference/statements/select/where.md) clause, but the difference is that `WHERE` is performed before aggregation, while `HAVING` is performed after it.
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It is possible to reference aggregation results from `SELECT` clause in `HAVING` clause by their alias. Alternatively, `HAVING` clause can filter on results of additional aggregates that are not returned in query results.
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## Limitations {#limitations}
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`HAVING` can’t be used if aggregation is not performed. Use `WHERE` instead.
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