Trying to 'join' either of 2 tables to a third

Let's see how to explain this. I have customer info in one table & 2 different types of transaction info in 2 other tables (call it financial & informational transactions). All tables carry the customer ID.

I need to retrieve customer & transaction info if customer has either specific financial transactions or has specific informational transactions. I can do either separately, but can't figure out how to do them both. If I join all 3 tables then I get info on customers that have both financial & informational transactions.

Select cust_info, financial_info, tran_info from cust_table, financial_table, tran_table where cust_table.cust_id=financial_table.cust_id and cust_table.cust_id=tran_table.tran_id

I've got to put an or in there somewhere, but I'm not sure where. Tried

Select cust_info, financial_info, tran_info from cust_table, financial_table, tran_table where cust_table.cust_id=financial_table.cust_id or cust_table.cust_id=tran_table.tran_id

and haven't gotten results back after 15 minutes. Either SQL*Plus locked up or it's joining everything to everything (cust_table only has 5000 records but financial_table has 1.2 million & tran_table has over 150,000). Received on Thu Apr 26 2001 - 18:53:19 CDT