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sometimes there is a need to perform grouping on more than one column it means that first grouping is performed on first column and within that group grouping is performed on second column lets understand the concept within an example here we wish to find total salary being paid to each job title in each department and then within the group of each department grouping is performed on job field in this case first grouping will be made on department field and within the group of each department grouping will be performed on job field so that total salary can be found for this sub group i.e each job for each department in simple words here we wish to perform a group within another group to understand this concept let us consider a given database of employee having 5 columns Eno Ename Job Salary and Deptno we wish to find total salary paid to each job in each department to perform this operation only 3 columns i.e Job Salary and Deptno will play its role so simplify this database by sele