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update docs/en/sql-reference/functions/string-functions.md

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zxc111 2021-07-17 15:58:48 +08:00
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docs/en/sql-reference/functions/string-functions.md
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@ -13,13 +13,14 @@ toc_title: Strings
Returns 1 for an empty string or 0 for a non-empty string.
The result type is UInt8.
A string is considered non-empty if it contains at least one byte, even if this is a space or a null byte.
The function also works for arrays.
The function also works for arrays or UUID.
UUID is empty if it is all zeros (nil UUID).
## notEmpty {#notempty}
Returns 0 for an empty string or 1 for a non-empty string.
The result type is UInt8.
The function also works for arrays.
The function also works for arrays or UUID.
## length {#length}