I am fairly new with SQL so please excuse what are most likely very simple questions.

I am looking to understand the pros and cons with SQL.
On large files with data that will be used in various applications and in various sort-by schemes, are logical files a help?
If so, does one reference the physical file and then SQL finds the best logical, or does it help to specify a specific logical file?
What is the right way to collect a set of records equal to SFLPAGE?

So far, I believe my biggest problem is that I haven't yet figured out how to ask the right questions.

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