Need Recommendation of Online Sources in Learning to Use the Relational DBs

Please recommend some online sources in learning to use the relational databases; such as the ways relational databases are different from flat files, how to retrieve data from relational database tables. Thank you.

Actually I figured the OP was looking for a source that would instruct one in building ones own database rather than using an existing one.
Myself I would just buy a book (or read the one I already have.) I wouldn't expect to find to many sources like that online althoug one might find some college course materials for a class.

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BR
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Brice

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Need Recommendation of Online Sources in Learning to Use the Relational DBs

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