Question

Two tables are given

PilotGroup Table

Pilot            Plane  

Jon Smith      A1-Fighter
Jon Smith   B1-Fighter
Gravell     A2-Fighter
Jon Skeet   A1-Fighter
Jon Skeet   B1-Fighter
Jon Skeet   A4-Fighter
Gravell     A5-Fighter

SouthOperation Table

Plane
A1-Fighter
B1-Fighter

The task is to print the pilot names who is trained on both A1-Fighter and B1-Fighter.

I got the result by executing

select distinct pilot from PilotGroup  as pg1
   where not exists
        ( 
           select * from SouthOperation Sop where 
              not exists
              ( 
                select *from PilotGroup  as pg2 where ( pg1.pilot = pg2.pilot) 
                 and 
                (pg2.plane= Sop.plane)
               )
        )

Is there any alternatives to search the rows against other table?

Answer 1

select 
    pilot 
from 
    pilotgroup pg 
    inner join
    southoperation sop on (pg.plane = sop.plane)
group by 
    pilot
having 
    count(pg.plane) = (select count(*) from southoperation)