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The main differencre between subquery and co-related subquery is that in subquery child query is executed first n then parent,but in co-related subquery main query is executed first(even though parenthesis are present) and then child query. Example of co-related subquery select dname from dept where exists
(select deptno from emp
where dept.deptno=emp.deptno); select dname from dept where not exists
(select deptno from emp
where dept.deptno=emp.deptno);
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