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COUNTCOUNT is an aggregate function that counts the number of rows accessed in an expression (see Aggregates (Set Functions)). COUNT is allowed on all types of expressions, even those that evaluate to Java data types. SyntaxThe DISTINCT qualifier eliminates duplicates. The ALL qualifier retains duplicates. ALL is assumed if neither ALL nor DISTINCT is specified. For example, if a column contains the values 1, 1, 1, 1, and 2, COUNT(col) returns a greater value than COUNT(DISTINCT col). Only one DISTINCT aggregate expression per SelectExpression is allowed. For example, the following query is not allowed: An Expression can contain multiple column references or expressions, but it cannot contain another aggregate or subquery. If an Expression evaluates to NULL, the aggregate is not processed for that value. The resulting data type is LONGINT. Example
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