The HAVING clause specifies the properties of a group.
Syntax
<having_clause> ::= HAVING <search_condition>
search_conditionExplanation
Each
expression in the search condition that does not occur in the argument of a set function (set_function_spec) must identify a grouping column.If the having clause is used without a
GROUP clause, the result table built so far is regarded as a group.The search condition is applied to each group in the result table. The result of the HAVING clause is a table that only contains those groups for which the search condition is true.