PLS-00405: subquery not allowed in this context
Cause: A subquery was used in an inappropriate context, such as: if (SELECT deptno FROM emp WHERE ... ) = 20 then ... Subqueries are allowed only in SQL statements.
Action: The same result can be obtained by using a temporary variable, as in: SELECT deptno INTO temp_var FROM emp WHERE ...; IF temp_var = 20 THEN ...
PLS-00407
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PLS-00405subquery not allowed in this context