The first thing we learn to do with SQL is writing a SELECT statement to get data from one table. This kind of statement seems to be straightforward and very close to the language we speak.
But real-world queries are often much more sophisticated than those simple SELECT statements.
First of all, usually the data we need is split into several different tables. This is a natural consequence of data normalization, which is an essential feature of any well designed database model. And SQL gives you the power to put that data together.
In the past, DBAs and developers used to put all necessary tables and/or views in the FROM clause and then use theWHERE clause to define how the records from each table would combine with the other records. (To make this text a bit more readable, from now on, I will simplify things and say "table" instead of "table and/or view").
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Computer Tutorials,Database,SQL,SQL Joins
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