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In database management an aggregate function is a function where the values of multiple rows are grouped together as input on certain criteria to form a single value of more significant meaning or measurement such as a set, a bag or a list. Common aggregate functions include : Average() (i.e., arithmetic mean)
SQL Server: CAST Function. This SQL Server tutorial explains how to use the CAST function in SQL Server (Transact-SQL) with syntax and examples. In SQL Server (Transact-SQL), the CAST function converts an expression from one datatype to another datatype. Syntax The syntax for the CAST function in SQL Server (Transact-SQL) is: CAST( expression AS type [ (length) ] ) Parameters or Arguments expression The value to convert to another datatype. type The datatype that you wish to convert expression to.