.NET and SQL Server interview questions - Which query is used to merge two different columns into single column?

Answer:

let's us assume that we have the following table of Employee.





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:-




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