String Functions (Transact-SQL)

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

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

When string functions are passed arguments that are not string values, the input type is implicitly converted to a text data type. For more information, see Data Type Conversion (Database Engine).

See Also

Reference

Built-in Functions (Transact-SQL)