Question

I’m new to SQL and was just wondering how I would a value from a table only when it meets a certain condition.

I have a table that looks like the following (sorry for the rubbish formatting)

COL1 - COL2

 1   -  3  
 1   -  2 
 2   -  2
 3   -  3
 3   -  4

I want to get values from COL1, but only if they don’t have a specific value in COL2.

So for example if I didn’t want the values where COL2 was 3, the only value that would be returned from COL1 would be 2.

Thanks for any help

To clarify, the two columns just store id’s that reference other tables. I only want the values from COL1 that don’t reference a specific values in COL2.

so when I saw I don’t want the values where COL2 is equal to 3, this means the value ‘1’ from COL1 won’t be returned as on row 1 COL2 is 3 and 3 won’t be returned from COL1 because on row4 COL2 is equal to 3

Answer 1

I think you look for something like this.

select COL1
from TABLE_FOO
where  COL1 not in (
  select COL1
  from TABLE_FOO
  where COL2 = 3
)