October 2013
Intermediate to advanced
580 pages
18h 5m
English
book
Pro Oracle SQL, Second Edition
by Karen Morton, Kerry Osborne, Robyn Sands, Riyaj Shamsudeen, Jared Still
Content preview from Pro Oracle SQL, Second Edition
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CHAPTER 4
SQL Is about Sets
One of the most difficult transitions to make to become highly proficient at writing SQL well is to shift from thinking procedurally to thinking declaratively (or in sets). It is often hardest to learn to think in sets if you’ve spent time working with virtually any programming language. If this is the case for you, you are likely very comfortable with constructs such as IF-THEN-ELSE, WHILE-DO, LOOP-END LOOP, and BEGIN-END. These constructs support working with logic and data in a very procedural, step-by-step, top-down–type approach. The SQL language is not intended to be implemented from a procedural point of view, ...
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