all internal matter on the manipulation of join.

Hello all;

I have these two different dataset below
 
ID              test
A                20
B                  9
C                  3
D                  8
E                14
F                  9
second series
ID            Fail_test
B                  1
C                  1
E                  1
F                  3
Now I wish that this whole

ID                        Test               Fail_test
A                          20                    0
B                           9                     1
C                           3                     1
D                           8                     0
E                          14                    1
F                            9                    3
I tried to use the join internal ID for both sets, but which will leave a and d... What type of join can use... Any help is appreciated. Thank you.

HI - try this:

select id, test, fail_test, (test-fail_test) as Pass
from
(
  select s1.id, s1.test, nvl(s2.fail_test, 0) fail_test
  from first_set s1
  left join second_set s2 on s1.id = s2.id;
) p

Thank you

Tags: Database

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