Question

I’m joining a table onto another as per the normal method (attached to an ID column). This is working fine and returns a row when I run the query. However, if I try to join another table onto the same ID column, I get an empty result set. Is this legal in Oracle, or will I have to find another way around it?

Cheers.

EDIT: The code:

INNER JOIN    TABLE2
ON            TABLE1.ID = TABLE2.ID

INNER JOIN    TABLE3
ON            TABLE1.ID = TABLE3.ID

I’ve also tried joining table 3 onto table 2, but that had no effect, either

Answer 1

It turns out that my issue was not in the join statement, but in the WHERE clause underneath it. The join works fine.

To answer my question, therefore: Yes, it’s legal.