Question

If you are given table given in below structure.

empid | empname | salary | managerid

How will you find results as

empid | empname | salary | managername

because manager is also a part of employee

Answer 1

You can do a self-join, linking the ManagerId of the first table (employees) to the EmpId of the second use of Employee (managers):

SELECT e.empid, e.empname, e.salary
   , COALESCE(m.empname, 'NoManager') AS ManagerName
FROM Employee AS e
LEFT JOIN Employee AS m ON e.ManagerId = m.empId