MSSQL Functions

The MSSQL Transact-SQL programming language provides three types of functions:

  • Rowset functions

    Can be used like table references in an SQL statement. For more information about a list of these functions, see Rowset Functions.

  • Aggregate functions

    Operate on a collection of values but return a single, summarizing value. For more information about a list of these functions, see Aggregate Functions.

  • Scalar functions

    Operate on a single value and then return a single value. Scalar functions can be used wherever an expression is valid. This table categorizes the scalar functions.

Function category Explanation
Configuration Functions Returns information about the current configuration.
Cursor Functions Returns information about cursors.
Date and Time Functions Performs an operation on a date and time input value and returns either a string, numeric, or date and time value.
Mathematical Functions Performs a calculation based on input values provided as parameters to the function, and returns a numeric value.
Metadata Functions Returns information about the database and database objects.
Security Functions Returns information about users and roles.
String Functions Performs an operation on a string (char or varchar) input value and returns a string or numeric value.
System Functions Performs operations and returns information about values, objects, and settings in Microsoft® SQL Server™.
System Statistical Functions Returns statistical information about the system.
Text and Image Functions Performs an operation on a text or image input values or column, and returns information about the value.

Thanks for: msdn.microsoft.com