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Update string-functions.md

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docs/en/sql-reference/functions/string-functions.md
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@ -5,6 +5,9 @@ toc_title: Strings
# Functions for Working with Strings {#functions-for-working-with-strings}
!!! note "Note"
Functions for [searching](string-search-functions.md) and [replacing](string-replace-functions.md) in strings are described separately.
## empty {#empty}
Returns 1 for an empty string or 0 for a non-empty string.