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taiyang-li 2024-07-01 15:36:08 +08:00
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docs/en/sql-reference/functions/string-functions.md
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@ -734,13 +734,13 @@ concat(s1, s2, ...)
**Arguments** **Arguments**
At least one value of arbitrary type. Values of arbitrary type. Empty argument is also allowed.
Arguments which are not of types [String](../data-types/string.md) or [FixedString](../data-types/fixedstring.md) are converted to strings using their default serialization. As this decreases performance, it is not recommended to use non-String/FixedString arguments. Arguments which are not of types [String](../data-types/string.md) or [FixedString](../data-types/fixedstring.md) are converted to strings using their default serialization. As this decreases performance, it is not recommended to use non-String/FixedString arguments.
**Returned values** **Returned values**
The String created by concatenating the arguments. The String created by concatenating the arguments. If there are no arguments, the function returns empty string.
If any of arguments is `NULL`, the function returns `NULL`. If any of arguments is `NULL`, the function returns `NULL`.