MAX
The MAX function returns the maximum value in a set of values.
The schema is SYSIBM.
The arguments must be compatible. For more information on compatibility, refer to the compatibility matrices in Assignment and comparison. All arguments except the first argument can be parameter markers.
This function cannot be used as a source function when creating a user-defined function.
- expression
- An expression that returns the value
of a built-in data type. Each expression must return a value that
is not a CLOB, DBCLOB, BLOB, ROWID, or XML. Character string arguments
and binary string arguments cannot have a length attribute greater
than 32704, and graphic string arguments cannot have a length attribute
greater than 16352.
If there are any mixed character string or graphic string and numeric arguments, the string value is implicitly cast to a DECFLOAT(34) value.
The result of the function is the largest argument value. The data type of the result and its other attributes (for example, the length and CCSID of a string or a datetime value) are the same as the data type and attributes of the argument values. The result can be null.
The function is applied to the set of values derived from the argument values by the elimination of null values.
If the function is applied to an empty set, the result is the null value. Otherwise, the result is the maximum value in the set.
The specification of DISTINCT has no effect on the result and is not advised.
EXEC SQL SELECT MAX(SALARY) / 12
INTO :MAX_SALARY
FROM DSN8A10.EMP;
EXEC SQL SELECT MAX(LASTNAME)
INTO :LAST_NAME
FROM DSN8A10.EMP;