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Having Clause In ORACLE

  • This clause is used to provide a condition on group functions, which may filter the data based on the data retrieved at group function.
  • You must need group by clause while declaring having by clause.


   Example:=  
       
      1)   Display deptno and total sal of those dept whose total sal is greater  than 9000.

Ans : Select deptno, sum(sal) from emp
        Group by deptno
        Having sum(sal)> 9000;

      2)  Display deptno and number of employees working at each dept, only for those departments where more than 3 employees are working.

       Ans :  Select deptno, count(*) from emp
                Group by deptno
                Having count(*)>3;


 3) Calculate designation wise investments only when overall investments on the designation crosses 5000 excluding all such designation having SALES patterns.

        Ans : Select deptno, avg(sal)
                From emp
                where job like 'SALES%'
                Group by deptno
                Having max(sal)>5000;






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