How to get data from multiple tables

Hello Everyone,
I need to read data from a few tables (VBAK, VBAP, VBUK, VBUP etc.) because I'd like to get all open Sales Orders. I've tried to use RFC_READ_TABLE but it looks like it can read only 1 table at a time. I've tried to read data from individual table and then join them but it didn't work out very well because I got about 1.5 millions records from just the VBUP table. So anyone knows if there is any function that I can use to join those tables and just get the records I need?
Any help would be highly appreciated.

Hi Nhan,
Thank you for your reply.
Do I have to be a SAP developer to create BAPI on SAP? What kind of access rights do I need?
I've tired to use other BAPIs such as BAPI_SalesOrder_GetList and it doesn't work for me because I don't have all customer numbers and I need to get all un-shipped orders for all customers.
I've read a post on the internet brieftly menitoned that we can create a table to store information about the tables we want to join and then call the RFC_READ_TABLE function. Do you know if that is possible?
Is there any other way you can think of?

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>
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A----------------***
B----------------X
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Message was edited by:
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How to get data from multiple tables

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