MySQL SUM() Function
Example
Return the sum of the "Quantity" field in the "OrderDetails" table:
  SELECT SUM(Quantity) AS TotalItemsOrdered FROM OrderDetails;
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Definition and Usage
The SUM() function calculates the sum of a set of values.
Note: NULL values are ignored.
Syntax
  SUM(expression)
Parameter Values
| Parameter | Description | 
|---|---|
| expression | Required. A field or a formula | 
Technical Details
| Works in: | From MySQL 4.0 | 
|---|

