NULL values are excluded. Why?

Question

This is about a bizarre behaviour I found in Microsoft Sql Server. Please correct me if I\'m wrong.

SELECT COUNT(*) FROM TABLEA 
WHERE [Column1] IS NULL;
         


        

Answer 1

Best answer would be just to use below condition in where clause

ISNULL(t1.[Column1],'') NOT IN ('Cross/Up sell', 'Renegotiation', 'Renewal')