String Functions (Transact-SQL)

Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric

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 except FORMAT 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)