String Functions (Transact-SQL)

THIS TOPIC APPLIES TO: yesSQL Server (starting with 2008)yesAzure SQL DatabaseyesAzure SQL Data Warehouse yesParallel Data Warehouse

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

ASCII CHAR CHARINDEX
CONCAT CONCAT_WS DIFFERENCE
FORMAT LEFT LEN
LOWER LTRIM NCHAR
PATINDEX QUOTENAME REPLACE
REPLICATE REVERSE RIGHT
RTRIM SOUNDEX SPACE
STR STRING_AGG STRING_ESCAPE
STRING_SPLIT STUFF SUBSTRING
TRANSLATE TRIM UNICODE
UPPER

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

Built-in Functions (Transact-SQL)