Answer:
let’s us assume that we have the following table of Employee.
| Emp_Id |
Emp_Name |
Emp_Salary_2010 |
Emp_Salary_2011 |
| 1 |
Shiv |
17000 |
19000 |
| 2 |
Raju |
13500 |
15000 |
| 3 |
Sham |
15000 |
18000 |
| 4 |
Moosa |
11000 |
14000 |
| 5 |
Feroz |
12000 |
16000 |
Now we want to merge the Emp_Salary_2010 and Emp_Salary_2011 columns into a single column as Salary.
Query:-
select Emp_Name,Emp_Salary_2010 as Salary from Employee
union
select Emp_Name,Emp_Salary_2011 as Salary from Employee
Output:-
| Emp_Name |
Salary |
| Shiv |
17000 |
| Shiv |
19000 |
| Raju |
13500 |
| Raju |
15000 |
| Sham |
15000 |
| Sham |
18000 |
| Moosa |
11000 |
| Moosa |
14000 |
| Feroz |
12000 |
| Feroz |
15000 |
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