case statement in SQL, how to return multiple variables?

Question

I would like to return multiple values in my case statement, such as :

SELECT
  CASE
    WHEN  THEN 
    WHEN          


        

Answer 1

You could use a subselect combined with a UNION. Whenever you can return the same fields for more than one condition use OR with the parenthesis as in this example:

SELECT * FROM
  (SELECT val1, val2 FROM table1 WHERE (condition1 is true) 
                                    OR (condition2 is true))
UNION
SELECT * FROM
  (SELECT val5, val6 FROM table7 WHERE (condition9 is true) 
                                    OR (condition4 is true))