April 2007
Intermediate to advanced
1032 pages
19h 28m
English
book
SQL for MySQL Developers: A Comprehensive Tutorial and Reference
by Rick F. van der Lans, Diane Cools
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Chapter 7. SELECT Statement: The FROM Clause
7.1 Introduction
If a table expression contains a FROM clause, the processing starts with this clause. In fact, in this case, it is the starting point of processing a table expression, which is why we discuss this clause in detail first.
This chapter describes the basic features of the FROM clause. In previous chapters, you saw many examples of this clause. The FROM clause is an important clause because each table from which we “use” columns in the other clauses should be specified here. By “using,” we mean, for example, that a column appears in a condition or in the SELECT clause. Simply, in the FROM clause, we specify the tables from which the result of a table expression is retrieved.
The FROM ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.