mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-12 09:22:05 +00:00
27 lines
1.0 KiB
Markdown
27 lines
1.0 KiB
Markdown
---
|
|
sidebar_position: 191
|
|
---
|
|
|
|
# uniqExact
|
|
|
|
Calculates the exact number of different argument values.
|
|
|
|
``` sql
|
|
uniqExact(x[, ...])
|
|
```
|
|
|
|
Use the `uniqExact` function if you absolutely need an exact result. Otherwise use the [uniq](../../../sql-reference/aggregate-functions/reference/uniq.md#agg_function-uniq) function.
|
|
|
|
The `uniqExact` function uses more memory than `uniq`, because the size of the state has unbounded growth as the number of different values increases.
|
|
|
|
**Arguments**
|
|
|
|
The function takes a variable number of parameters. Parameters can be `Tuple`, `Array`, `Date`, `DateTime`, `String`, or numeric types.
|
|
|
|
**See Also**
|
|
|
|
- [uniq](../../../sql-reference/aggregate-functions/reference/uniq.md#agg_function-uniq)
|
|
- [uniqCombined](../../../sql-reference/aggregate-functions/reference/uniq.md#agg_function-uniqcombined)
|
|
- [uniqHLL12](../../../sql-reference/aggregate-functions/reference/uniq.md#agg_function-uniqhll12)
|
|
- [uniqTheta](../../../sql-reference/aggregate-functions/reference/uniqthetasketch.md#agg_function-uniqthetasketch)
|