Find the schema which contains all these tables

Question

In my DB, only SCOTT has all the three tables EMP,DEPT, BONUS. There are schemas which have either one or two of these tables but only SCOTT has all these 3 tables.
To find the schema which contains all these *3* tables. I tried the below mentioned queries which gave the wrong answers.
1.
select TABLE_NAME, owner from dba_Tables where table_name IN ('EMP','DEPT', 'BONUS')-- will return any schema which has any of these tables. So, wrong result
2.
select TABLE_NAME, owner from dba_Tables where table_name = 'EMP' AND TABLE_NAME='DEPT' AND TABLE_NAME= 'BONUS'-- Wrong result because it is mutually contradictory. As AP has mentioned below, A table_name cannot be equal to all the three tables .
Edited by: GarryB on Dec 22, 2010 7:56 AM

Answer 1

Hi,
GarryB wrote:
Thanks everyone. So, this means that this seemingly simple query cannot be written with just a plain AND , OR . Right?You're right. Every query needs SELECT and FROM, for example.
What's wrong with Solomon's simple solution?
Whatever you don't like about it, I'm sure there's another approach that doesn't have the same problem, even if it is slower and more complicated.
As AP pointed out, no one row has all the information you need to decide if that row will be part of the result set or not.
You need something that can make a decision based on the data in multiple rows.
GROUP BY, like Solomon suggested, is the easiest and most efficient way I know of.
Anything that GROUP BY does can probably be done by analytic functions. In this case, it will be more complicated and slower, but you can get the same results.
A self-join, as user13524665 demonstrated, is another way.
You could also get the results you want using EXISTS-, IN-, or scalar sub-queries, all of which would be even more complicated, and scale just as poorly, as a self-join.
CONNECT BY, recursive sub-queries, MODEL, and XML functions can also look at several rows at the same time. I don't believe you want to read and test soltuions for all of these any more than I want to write all of them. Solomon gave a good solution for your original problem. If you want to add some extra restrictions to your problem (such as "I can't use ... or ...") explain clearly what those restrictions are, and why you need them.