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The subquery is an INSERT, UPDATE, or DELETE statement. A with_query2 referenced more than once refers to a self-referential with_query1 from an outer layer, then with_query2 cannot be replaced at the reference point.
Currently, this parameter is valid only for the SELECT, INSERT, DELETE, UPDATE, and CREATE TABLE AS statements.
To delete the subplan, modify the statement as follows: 1 explain(costs off) select * from t1 where exists (select 1 from t2 where t1.c1 = t2.c1 and t1.c2 = t2.c2); In this way, the subplan is replaced by the semi-join between the two tables, significantly improving the execution
Non-reserved Reserved Reserved DECODE Non-reserved (cannot be a function or type) - - DEFAULT Reserved Reserved Reserved DEFAULTS Non-reserved - - DEFERRABLE Reserved Reserved Reserved DEFERRED Non-reserved Reserved Reserved DEFINED - Non-reserved - DEFINER Non-reserved Non-reserved - DELETE
