Said Salomon Unitrin Direct Insurance T-SQL Aggregate Functions Said Salomon

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AVGMIN CHECKSUM_AGGSUM COUNTSTDEV COUNT_BIGSTDEVP GROUPINGVAR MAXVARP

 Returns the average of the values in a group.  Syntax: AVG ( [ ALL | DISTINCT ] expression )  All Applies the aggregate function to all values. ALL is the default.  DISTINCT Specifies that AVG be performed only on each unique instance of a value, regardless of how many times the value occurs.  Expression Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type. Aggregate functions and subqueries are not permitted.expression

 Returns the checksum of the values in a group.  Syntax: CHECKSUM_AGG ( [ ALL | DISTINCT ] expression )  All Applies the aggregate function to all values. ALL is the default.  DISTINCT Specifies that CHECKSUM_AGG be performed only on each unique instance of a value, regardless of how many times the value occurs.  Expression Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type. Aggregate functions and subqueries are not permitted.

 Returns the number of items in a group.  Syntax: COUNT ( { [ [ ALL | DISTINCT ] expression ] | * } )  All Applies the aggregate function to all values. ALL is the default.  DISTINCT Specifies that COUNT be performed only on each unique instance of a value, regardless of how many times the value occurs.  Expression Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type. Aggregate functions and subqueries are not permitted.  * Specifies that all rows should be counted to return the total number of rows in a table.

 Same as Count expect it returns bigint

 Indicates whether a specified column expression in a GROUP BY list is aggregated or not.  Syntax: GROUPING ( )  column_expression Is a column or an expression that contains a column in a GROUP BY clause.

 Returns the maximum value in the expression.  Syntax: MAX ( [ ALL | DISTINCT ] expression )  All Applies the aggregate function to all values. ALL is the default.  DISTINCT Specifies that MAX be performed only on each unique instance of a value, regardless of how many times the value occurs.  Expression Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type. Aggregate functions and subqueries are not permitted.

 Returns the minimum value in the expression.  Syntax: MIN ( [ ALL | DISTINCT ] expression )  All Applies the aggregate function to all values. ALL is the default.  DISTINCT Specifies that MIN be performed only on each unique instance of a value, regardless of how many times the value occurs.  Expression Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type. Aggregate functions and subqueries are not permitted.

 Returns the sum of all the values.  Syntax: SUM ( [ ALL | DISTINCT ] expression )  All Applies the aggregate function to all values. ALL is the default.  DISTINCT Specifies that SUM be performed only on each unique instance of a value, regardless of how many times the value occurs.  Expression Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type. Aggregate functions and subqueries are not permitted.

 Returns the statistical standard deviation of all values in the specified expression.  Syntax: STDEV ( [ ALL | DISTINCT ] expression )  All Applies the aggregate function to all values. ALL is the default.  DISTINCT Specifies that STDEV be performed only on each unique instance of a value, regardless of how many times the value occurs.  Expression Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type. Aggregate functions and subqueries are not permitted.

 Returns the statistical standard deviation for the population for all values in the specified expression.  Syntax: STDEVP ( [ ALL | DISTINCT ] expression )  All Applies the aggregate function to all values. ALL is the default.  DISTINCT Specifies that STDEVP be performed only on each unique instance of a value, regardless of how many times the value occurs.  Expression Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type. Aggregate functions and subqueries are not permitted.

 Returns the statistical variance of all values in the specified expression.  Syntax: VAR ( [ ALL | DISTINCT ] expression )  All Applies the aggregate function to all values. ALL is the default.  DISTINCT Specifies that VAR be performed only on each unique instance of a value, regardless of how many times the value occurs.  Expression Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type. Aggregate functions and subqueries are not permitted.

 Returns the statistical variance for the population for all values in the specified expression.  Syntax: VARP ( [ ALL | DISTINCT ] expression )  All Applies the aggregate function to all values. ALL is the default.  DISTINCT Specifies that VARP be performed only on each unique instance of a value, regardless of how many times the value occurs.  Expression Is an expression of the exact numeric or approximate numeric data type category, except for the bit data type. Aggregate functions and subqueries are not permitted.

 Aggregate Functions (books Online)  SQL Server 2008, Dev Edition  My Twitter SaidSalomon