To reference three different tables automatically

Question

I have three tables with different structure. but each of these three tables have one field in common, which is idx. I have a final table in which i have data from all these tables (final).
Emp
Sal
INcome
final
idx source
1 Emp
1 sal
2 income
2 emp
3 sal
i wnat to check
select a.idx from final a, emp b where a.idx=b.idx and source='Emp'
for second table i have to change table name, each time
Is there anyway to write a query which should pick the next table automatcially.
Best Regards,
Abida

Answer 1

Just remember that this is a SQL*Plus solution.. and not SQL. Something that the OP may confuse with each other.
Simply put - no it cannot be done in SQL.
If need to be done, then another tool/language needs to be used to create and control the SQL generated. Such as PL/SQL or Java or C# or SQL*Plus - though the latter is so primitive you would have a problem "to pick up" the next table name. SQL*Plus does not support and conditional and loop statements with its primitive macro language.