October 2012
Beginner
288 pages
4h 37m
English
Content preview from Sams Teach Yourself SQL in 10 Minutes, Fourth Edition
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Lesson 13. 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 7, “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_title FROM Vendors ORDER 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 multiple uses of the same ...
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