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Raúl Marín 2023-11-27 23:29:03 +01:00
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docs/en/sql-reference/aggregate-functions/reference/any.md
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Selects the first encountered value of a column.
By default, it ignores NULL values and returns the first NOT NULL value found in the column. As [`first_value`](../first_value.md) if supports `RESPECT NULLS`, in which case it will select the first value passed, independently on whether it's NULL or not.
By default, it ignores NULL values and returns the first NOT NULL value found in the column. As [`first_value`](../../../sql-reference/aggregate-functions/reference/first_value.md) if supports `RESPECT NULLS`, in which case it will select the first value passed, independently on whether it's NULL or not.
The return type of the function is the same as the input, except for LowCardinality which is discarded). This means that given no rows as input it will return the default value of that type (0 for integers, or Null for a Nullable() column). You might use the `-OrNull` [combinator](../../combinators.md) ) to modify this behaviour.

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docs/en/sql-reference/aggregate-functions/reference/first_value.md
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# first_value
It is an alias for [`any`](../any.md) but it was introduced for compatibility with [Window Functions](../../window-functions/index.md), where sometimes it's necessary to process `NULL` values (by default all ClickHouse
aggregate functions ignore NULLs).
It is an alias for [`any`](../../../sql-reference/aggregate-functions/reference/any.md) but it was introduced for compatibility with [Window Functions](../../window-functions/index.md), where sometimes it's necessary to process `NULL` values (by default all ClickHouse aggregate functions ignore NULL values).
It supports declaring a modifier to respect nulls (`RESPECT NULLS`), both under [Window Functions](../../window-functions/index.md) and in normal aggregations.