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ETL tools provide very robust support for complex business logic.
However, I do not want you to think that it is a panacea. At times you
will find the need to encapsulate very complex tasks or to solve
performance limitations, that you need to use the database's procedural
language or a 3GL program to solve these issues.
ETL tools will help you in centralizing your functionality and to
simplify your long-term maintenance. I used SQR in much the same way you
are today for its support of complex logic, but if I were to choose
today, I would suggest an ETL tool as my deployment option.
I would suggest to you that you talk to the leading ETL vendors and have
them show you how they would support your complex business rules with
their tools.
Hope this helps, good luck.
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