Question

I have two tables:
Table: AA with columns A, B , C, D
Table: BB with columns E , F G

I want to get output which is a combination of these two tables like following:

A | B | C | D | E | F | G

I am currently doing following:

Select * from ( 

( select A, B, C ,D from AA where some condition)

UNION ALL

( select E , F , G , NULL from BB where some condition) )

But it is giving me output which contains only A , B , C , D from AA table while it’s not adding E, F , G from table BB.

What am I doing wrong?

Answer 1

not sure exactly what you idea is , but if you want just plain data from AA and BB in same table display then you can use something like this

 ( select A, B, C ,D, NULL as E, NULL as F, NULL as G from AA where some condition)

 UNION ALL

( select NULL as A , NULL as B, NULL as C, NULL as D, E , F , G  from BB where some condition) )

but not sure what is the point of this 😐

if you want some combination of data then join is must have.