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The chapter Querying data describes simple search conditions you can use in the HAVING clause. Since a subquery is just an expression that appears in the WHERE or HAVING clauses, the search conditions on subqueries may look familiar.
Subquery comparison test Compares the value of an expression to a single value produced by the subquery for each record in the table(s) in the main query. Comparison tests use the operators (=, <>, <. <=, >, >=) provided with the subquery.
Quantified comparison test Compares the value of an expression to each of the set of values produced by a subquery.
Subquery set membership test Checks if the value of an expression matches one of the set of values produced by a subquery.
Existence test Checks if the subquery produces any rows.
Subquery comparison test
Subqueries and the IN test
Subqueries and the ANY test
Subqueries and the ALL test
Subqueries and the EXISTS test
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