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  Oracle Database Tips by Donald Burleson

Basic SQL

The SQL language has three types of operations that allow you to manipulate the tables in any way you want.

Select - Gets the rows that you want:  The select operator shrinks the table vertically. In the example below, the "*" means to select all columns, and the WHERE clause removes rows that we don't want to see:

 Project - Chooses the columns you want to see.  Shrinks the table horizontally:

Join - Joins the table together, based on their common keys:

Now that we understand the basics of tables, let's take a look at how tables are designed.  We don't need to know all of the details, but it's important to understand how tables are structured.

 
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