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Update SUM function syntax and OVER clause details #10391

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Update SUM function syntax and OVER clause details
donican Sep 11, 2026
6dd7423
Update OVER clause explanation in sum-transact-sql.md
donican Sep 11, 2026
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10 changes: 7 additions & 3 deletions docs/t-sql/functions/sum-transact-sql.md
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Expand Up @@ -41,7 +41,7 @@ Returns the sum of all the values, or only the `DISTINCT` values, in the express
SUM ( [ ALL | DISTINCT ] expression )

-- Analytic Function Syntax
SUM ( [ ALL ] expression) OVER ( [ partition_by_clause ] [ order_by_clause ] )
SUM ( [ ALL ] expression) OVER ( [ partition_by_clause ] [ order_by_clause ] [row_or_range_clause] )
```

## Arguments
Expand All @@ -58,11 +58,15 @@ Specifies that `SUM` returns the sum of unique values.

A constant, column, or function, and any combination of arithmetic, bitwise, and string operators. *expression* is an expression of the exact numeric or approximate numeric data type category, except for the **bit** data type. Aggregate functions and subqueries aren't permitted. For more information, see [Expressions](../language-elements/expressions-transact-sql.md).

#### OVER ( [ *partition_by_clause* ] [ *order_by_clause* ] )
#### OVER ( [ *partition_by_clause* ] [ *order_by_clause* ] [ *row_or_range_clause* ] )

*partition_by_clause* divides the result set produced by the `FROM` clause into partitions to which the function is applied. If not specified, the function treats all rows of the query result set as a single group.

*order_by_clause* determines the logical order in which the operation is performed. For more information, see [SELECT - OVER clause](../queries/select-over-clause-transact-sql.md).
*order_by_clause* determines the logical order in which the operation is performed.

*row_or_range_clause* defines the window frame in which the function is applied. It requires *order_by_clause* to be specified. If *order_by_clause* is specified and *row_or_range_clause* isn't, *row_or_range_clause* assumes its default value `RANGE BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW`.

For more information, see [SELECT - OVER clause](../queries/select-over-clause-transact-sql.md).

## Return types

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