1. Said Salomon Unitrin Direct Insurance timelord@timelordshangout.com T-SQL Aggregate Functions Said Salomon

2.  I have over 25 year experience IT. I have a vast array of abilities in the field in the areas of Network, Desktop Support, DBA, Staff Project Management, Application Software Development, Business Analysis and Quality Assurance. I have Microsoft certifications as MCTS, MCPS, and MCNPS, and multiple certifications from the Insurance Institute of America. Currently I am a DBA at Unitrin Direct Insurance.

3. AVGMIN CHECKSUM_AGGSUM COUNTSTDEV COUNT_BIGSTDEVP GROUPINGVAR MAXVARP

4.  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

5.  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.

6.  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.

7.  Same as Count expect it returns bigint

8.  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.

9.  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.

10.  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.

11.  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.

12.  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.

13.  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.

14.  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.

15.  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.

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