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Oracle PL/SQL in 10 Minutes, Sams Teach Yourself by Ben Forta

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Lesson 16. Creating Advanced Joins

In this lesson, you’ll learn all about additional join types—what they are and how to use them. You’ll also learn how to use table aliases and how to use aggregate functions with joined tables.

Using Table Aliases

Back in Lesson 10, “Creating Calculated Fields,” you learned how to use aliases to refer to retrieved table columns. The syntax to alias a column looks like this:

Input

SELECT RTrim(vend_name) || ', (' || RTrim(vend_country) || ')' AS vend_titleFROM vendorsORDER BY vend_name;

In addition to using aliases for column names and calculated fields, SQL also enables you to alias table names. There are two primary reasons to do this:

To shorten the SQL syntax

To enable ...

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