Returns the maximum expression value found in each group of rows.
MAX( expression | DISTINCT expression )
MAX( expression ) OVER ( window-spec )
window-spec : see Syntax 2 instructions in the Remarks section below
expression The expression for which the maximum value is to be calculated. This is commonly a column name.
DISTINCT expression Returns the same as MAX( expression ), and is included for completeness.
The same data type as the argument.
Rows where expression is NULL are ignored. 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.
This function supports NCHAR inputs and/or outputs.
SQL/2003 Core feature. Syntax 2 is feature T611.
The following statement returns the value 138948.000, representing the maximum salary in the Employees table.
SELECT MAX( Salary ) FROM Employees;
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