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 Usage 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.
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;