Question

I have two tables, A and B, in Oracle:

   A (a1, a2)

   B (b1, b2, b3, b4, b5)

And some rows like:

  A(type1, 192.168.94.1)
   A(type1, 192.168.94.2)
   A(type2, 192.168.94.1)

   B(type1, 192, 168, 94, 1)
   B(type1, 192, 168, 94, 3)
   B(type2, 192, 168, 94, 2)

In table A, we have A(type1, 192.168.94.1)

In table B, we also have B(type1, 192, 168, 94, 1)

In table A, I want delete the row

   A(type1, 192.168.94.1)

Because its type like the type in table B

   A.a1 = B.b1
   -> type1 = type1

and the ip address duplicate when concatenating in B

   A.a2 = B.b2 ||'.'|| B.b3 ||'.'|| B.b4 ||'.'|| B.5
   -> 192.168.94.1 = 192.168.94.1

Could you give me some advice?

Answer 1

delete from A
where ROWID in 
    (select A.ROWID
     from A,B
     where A.A1 = B.B1
     and A.A2 = concat(B.B2, B.B3, B.B4)
    )