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HAVING clauseA HAVING clause restricts the results of a GROUP BY in a SelectExpression. The HAVING clause is applied to each group of the grouped table, much as a WHERE clause is applied to a select list. If there is no GROUP BY clause, the HAVING clause is applied to the entire result as a single group. SyntaxThe searchCondition, which is a specialized booleanExpression, can contain only grouping columns (see GROUP BY clause), columns that are part of aggregate expressions, and columns that are part of a subquery. For example, the following query is illegal, because the column C2 is not a grouping column, it does not appear within an aggregate, and it is not within a subquery: Aggregates in the HAVING clause do not need to appear in the SELECT list. If the HAVING clause contains a subquery, the subquery can refer to the outer query block if and only if it refers to a grouping column. Example
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