Returns the maximum expression value found in each group of rows.
MAX( expression | DISTINCT expression )
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.
SQL/2003 Core feature.
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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