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SUM function [Aggregate]

Returns the total of the specified expression for each group of rows.

SUM( expression | DISTINCT expression )

SUM( expression ) OVER ( window-spec )

window-spec : see Syntax 2 instructions in the Usage section below

expression    The object to be summed. This is commonly a column name.

DISTINCT expression    Computes the sum of the unique values of expression in the input.

Rows where the specified expression is NULL are not included.

Returns NULL for a group containing no rows.

Syntax 2 represents usage as a window function in a SELECT statement. As such, elements of window-spec can be specified either in the function syntax (inline), or in conjunction with a WINDOW clause in the SELECT statement. See the window-spec definition provided in WINDOW clause.

For more information about using window functions in SELECT statements, including working examples, see Window functions.

• COUNT function [Aggregate]
• AVG function [Aggregate]

• SQL/2003    Core feature. Syntax 2 is T611.

The following statement returns the value 3749146.740.

SELECT SUM( Salary )
FROM Employees;