Question

I tried performing join on three tables but i’m struck

Here where condition would be id = 0 and test =0 and data =0

Each table will have different no of columns

I want to select a,b,c in al three tables.

Thanks in advance

Answer 1

If I undertsand the question, which to be honest I don’t, are you looking for a union?

select a,b,c,0 as e,0 as f, test,data from table1
union
select a,b,c,e,f, test,data from table2
union
select a,b,c,0 as e,0 as f, test,data from table3

edit included e and f

edit2 You will need to add the where clause before each union

select a,b,c,0 as e,0 as f, test,data from table1
  where test= 1 and data =1 and id =0
union
select a,b,c,e,f, test,data from table2
  where test= 1 and data =1 and id =0
union
select a,b,c,0 as e,0 as f, test,data from table3
  where test= 1 and data =1 and id =0