THERE ARE

Table t1(id)

1
2
null
3
4



Table t2(id)

4
null
1
9
8





select a.id from t1 a where exists ( select 1 from t2 b
                                 where a.id != b.id
                                  )
  
Why the above  query return 1,4 as o/p

1
2
3
4

Sorry, nulls seing, I reacted somewhat like Pavlov's dogs

In this case, NULL values create problems as a null value or not no-matches other null it is the operator that is null is assigned. (must be the heat even if it is 22:00)

You might be after

with

As T1

(select 1 id of all the double union)

Select 2 Union double all the

Select null union to double all the

Select 3 in all the double union

Select 4 double

),

As T2

(select 1 id of all the double union)

Select null union to double all the

Select option 4 Union double all the

Select 9 Union double all the

Select 8 double

)

Select a.id

from one t1

If not exists (select null

b t2

where a.id = b.id

)

ID
-
3
2

Concerning

Etbin

Tags: Database

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