String Functions (Transact-SQL)

The following scalar functions perform an operation on a string input value and return a string or numeric value:

ASCII	NCHAR	SOUNDEX
CHAR	PATINDEX	SPACE
CHARINDEX	QUOTENAME	STR
DIFFERENCE	REPLACE	STUFF
LEFT	REPLICATE	SUBSTRING
LEN	REVERSE	UNICODE
LOWER	RIGHT	UPPER
LTRIM	RTRIM

All built-in string functions are deterministic. This means they return the same value any time they are called with a specific set of input values. For more information about function determinism, see Deterministic and Nondeterministic Functions.

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String Functions (Transact-SQL)

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