Answer / guest

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 ...

Please add more information about this Error

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