Below is the syntax..
Case key Value
when 'string/Number' then 'static Values'
End
Example:
SELECT ename,
CASE empid WHEN 1 THEN 'Admin'
WHEN 2 THEN 'AccountManager'
WHEN 3 THEN 'HRManager'
END as EmployeesDetails from Emp_Table
Like the above we use the select case clause.