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SQL stands for "Structured Query Language", and is used so that anyone can generate spontanious queries of a relational database without knowing what they are doing with computers.
However there is a serious mismatch between the data model used by SQL and the relational data model used by the underlying database. Further more, you don't even find all of the bits which do match being implimented in all SQL database front ends.
Most people will not fall over the problems unless they are doing very complex queries, which most users don't do.
Here are some tutorials that I found on the web: