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# uniqExact {#agg_function-uniqexact}
Calculates the exact number of different argument values.
``` sql
uniqExact(x[, ...])
```
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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.
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The `uniqExact` function uses more memory than `uniq` , because the size of the state has unbounded growth as the number of different values increases.
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**Arguments**
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The function takes a variable number of parameters. Parameters can be `Tuple` , `Array` , `Date` , `DateTime` , `String` , or numeric types.
**See Also**
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- [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 )
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- [uniqTheta ](../../../sql-reference/aggregate-functions/reference/uniqthetasketch.md#agg_function-uniqthetasketch )
