.NET and SQL Server interview questions – SQL query to merge two different columns into single column?

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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