Web Reference: The SQL SUM () Function The SUM() function is used to calculate the total sum of values within a specified numeric column. The SUM() function ignores NULL values in the column. The following SQL returns the sum of the Quantity field in the "OrderDetails" table: We can use SQL Server system function SUM () to easily get the sum of the values stored in a numeric column of the table. The SQL SUM function is an aggregate function that is used to perform a calculation on a set of values from a specified expression and return a single value in their output. Nov 19, 2025 · The SQL SUM () function is an aggregate function used to calculate the total value of a numeric column. It is widely used in reporting, financial calculations, and data analysis to quickly get overall totals.
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