Question

Is there away to select a table column on a condition ?, in this query :

SELECT x,y FROM Z

I want to make selecting the y column Y is conditioned, as:

SELECT x ( ONLY WHERE x_type = '20' ), y FROM Z # just example of what i am trying to do :)

y_type is another column, it’s value is what on which selecting Y or not depends !, Is there away to do that, or i am just hitting the wrong door ?

Answer 1

SELECT CASE WHEN y_type = 20 THEN y ELSE NULL END As y -- replace y_type with column to check
,.... -- other column list
FROM yourtable

You can also use a CASE with IN for multiple values eg.

SELECT CASE WHEN y_type IN (10,20) THEN y ELSE NULL END As y -- replace y_type with column to check
,.... -- other column list
FROM yourtable