COUNT
The COUNT function returns the number of rows or values in a set of rows or values.
.-ALL------. >>-COUNT(-+-+----------+--expression-+-)----------------------->< | '-DISTINCT-' | '-*------------------------'
The schema is SYSIBM.
The argument values can be of any built-in data type other than a BLOB, CLOB, DBCLOB, or XML.
The result is a large integer. The result cannot be null.
The argument of COUNT(*) is a set of rows. The result is the number of rows in the set. Any row that includes only null values is included in the count.
The argument of COUNT(expression) or COUNT(ALL expression) is a set of values. The function is applied to the set of values derived from the argument values by the elimination of null values. The result is the number of nonnull values in the set, including duplicates.
The argument of COUNT(DISTINCT expression) is a set of values. The function is applied to the set of values derived from the argument values by the elimination of null values and redundant duplicate values. The result is the number of different nonnull values in the set.
EXEC SQL SELECT COUNT(*)
INTO :FEMALE
FROM DSN8A10.EMP
WHERE SEX = 'F';
EXEC SQL SELECT COUNT(DISTINCT WORKDEPT)
INTO :FEMALE_IN_DEPT
FROM DSN8A10.EMP
WHERE SEX = 'F';