Follow us: Subscribe via RSS Feed Connect on YouTube Connect on YouTube

Pages

Saturday, 2 April 2016

SQL Rollup Grouping Cube

These are the enhancements to the group by feature.

USING ROLLUP

This will give the salaries in each department in each job category along with the total salary for individual departments and the total salary of all the departments.

SQL> Select deptno,job,sum(sal) from emp group by rollup(deptno,job);

                        DEPTNO   JOB         SUM(SAL)
                        ----------  ---------   ----------
        10    CLERK           1300
        10    MANAGER     2450
        10    PRESIDENT   5000
        10                              8750
        20    ANALYST       6000
        20    CLERK           1900
        20    MANAGER     2975
        20                             10875
        30    CLERK             950
        30    MANAGER      2850
        30    SALESMAN     5600
        30                              9400
                                          29025

USING GROUPING

 In the above query it will give the total salary of the individual departments but with a blank in the job column and gives the total salary of all the departments with blanks in deptno and job columns.

 To replace these blanks with your desired string grouping will be used
 SQL> select decode(grouping(deptno),1,'AllDepts',deptno),decode(grouping(job),1,'All  jobs',job),sum(sal) from emp group by rollup(deptno,job);

DECODE(GROUPING(DEPTNO),1,'ALLDEPTS',DEP DECODE(GR   SUM(SAL)
-----------------------------------  ----------------------------------    --------------
10                                                        CLERK             1300
10                                                         MANAGER                 2450
10                                                        PRESIDENT               5000
10                                                        All jobs                       8750
20                                                        ANALYST                   6000
20                                                        CLERK                        1900
20                                                        MANAGER                  2975
20                                                        All jobs                         10875
30                                                        CLERK                          950
30                                                        MANAGER                  2850
30                                                        SALESMAN                 5600
30                                                        All jobs                          9400
All Depts                                             All jobs                        29025

   Grouping will return 1 if the column which is specified in the grouping function has been used in rollup.
Grouping will be used in association with decode.

USING CUBE

This will give the salaries in each department in each job category, the total salary for individual departments, the total salary of all the departments and the salaries in each job category.

SQL> select decode(grouping(deptno),1,’All pts’,deptno),decode(grouping(job),1,’All
        Jobs’,job),sum(sal) from emp group by cube(deptno,job);

DECODE(GROUPING(DEPTNO),1,'ALLDEPTS',DEP DECODE(GR   SUM(SAL)
-----------------------------------  ------------------------------------  ------------
10                                            CLERK                         1300
10                                            MANAGER                              2450
10                                            PRESIDENT                           5000
10                                            All Jobs                                  8750
20                                            ANALYST                               6000
20                                            CLERK                         1900
20                                            MANAGER                              2975
20                                            All Jobs                               10875
30                                            CLERK                            950
30                                            MANAGER                               2850
30                                            SALESMAN                             5600
30                                            All Jobs                                  9400
All Depts                                            ANALYST                               6000
All Depts                                            CLERK                         4150
All Depts                                            MANAGER                              8275
All Depts                                            PRESIDENT                           5000
All Depts                                            SALESMAN                             5600

All Depts                                            All Jobs                               29025
Share this article :

0 comments:

Post a Comment