By Joe Celko

ISBN-10: 0123693799

ISBN-13: 9780123693792

SQL for Smarties was once hailed because the first booklet dedicated explicitly to the complex options had to rework an skilled SQL programmer into knowledgeable. Now, 10 years later and within the 3rd version, this vintage nonetheless reigns excellent because the ebook written by way of an SQL grasp that teaches destiny SQL masters. those should not simply tips and strategies; Joe additionally deals the easiest strategies to previous and new demanding situations and conveys how you have to imagine with the intention to get the main out of SQL programming efforts for either correctness and function.

In the 3rd version, Joe positive aspects new examples and updates to SQL-99, improved sections of question ideas, and a brand new part on schema layout, with a similar war-story educating kind that made the 1st and moment versions of this e-book classics.

* specialist recommendation from a famous SQL authority and award-winning columnist, who has given ten years of carrier to the ANSI SQL criteria committee and plenty of extra years of liable support to readers of on-line boards.
* Teaches rankings of complicated ideas that may be used with any product, in any SQL surroundings, if it is an SQL-92 or SQL-99 setting.
* deals suggestions for operating round method deficiencies.
* maintains to take advantage of struggle stories--updated!--that supply insights into real-world SQL programming demanding situations.

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Extra info for Joe Celko's SQL for Smarties: Advanced SQL Programming Third Edition

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The reason for this “benefit-of-the-doubt” feature is so that it will be easy to write constraints on NULL-able columns. The usual technique is to do simple range checking, such as CHECK (rating BETWEEN 1 AND 10), or to verify that a column’s value is in an enumerated set, such as CHECK (sex IN (0, 1, 2, 9)), with this constraint. Remember that the sex column could also be set to NULL, unless a NOT NULL constraint is also added to the column’s declaration. Although it is optional, it is a really good idea to use a constraint name.

It can mean many other things, but just consider those four for now. The problem is which of these four possibilities the NULL indicates depends on how it is used. To clarify this, imagine that I am looking at a carton of Easter eggs and I want to know their colors. If I see an empty hole, I have a missing egg, which I hope will be provided later. If I see a foil-wrapped egg, I have an unknown color value in my set. If I see a multicolored egg, I have a miscellaneous value in my set. If I see a cue ball, I have an inapplicable value in my set.

Celko', 'Database 101', 222, 6) ('Mr. Celko', 'Database 102', 223, 6) ('Ms. Shields', 'Database 101', 223, 6) Ms. Shields and I are both in room 223, trying to teach different classes at the same time. Matthew Burr looked at the constraints and the rules, and he came up with this analysis. , room is functionally dependent upon the combination of teacher and period. Likewise, if a teacher teaches only one class each period, then class is functionally dependent upon the combination of teacher and period.

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Joe Celko's SQL for Smarties: Advanced SQL Programming Third Edition by Joe Celko

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