Question

if I have a table with values like this:

ID  SUBID    FLAG
-----------------
 1      1       1
 1      2  (null)
 2      3       1
 2      3  (null)
 3      4       1
 4      5       1
 4      6  (null)
 5      7       0
 6      8  (null)
 7      9       1

and I would like to get all the ID’s where ‘FLAG’ is only set to 1, so in this case the query would return

ID  SUBID    FLAG
-----------------
 3      4       1
 7      9       1

How can I achieve this?

Answer 1

try this:

SELECT * FROM flags where flag=1
and ID NOT in( SELECT ID FROM flags where flag !=1 OR flag IS NULL)