By Joe Celko
ISBN-10: 0123693799
ISBN-13: 9780123693792
SQL for Smarties was once hailed because the first publication dedicated explicitly to the complicated concepts had to remodel an skilled SQL programmer into a professional. Now, 10 years later and within the 3rd version, this vintage nonetheless reigns very best because the ebook written through an SQL grasp that teaches destiny SQL masters. those will not be simply suggestions and methods; Joe additionally deals the easiest strategies to outdated and new demanding situations and conveys how you have to imagine with a view to get the main out of SQL programming efforts for either correctness and function.
In the 3rd variation, Joe positive aspects new examples and updates to SQL-99, extended sections of question options, and a brand new part on schema layout, with a similar war-story instructing sort that made the 1st and moment versions of this e-book classics.
* specialist suggestion from a famous SQL authority and award-winning columnist, who has given ten years of provider to the ANSI SQL criteria committee and lots of extra years of liable aid to readers of on-line boards.
* Teaches ratings of complex ideas that may be used with any product, in any SQL surroundings, if it is an SQL-92 or SQL-99 surroundings.
* bargains suggestions for operating round approach deficiencies.
* keeps to take advantage of battle stories--updated!--that provide insights into real-world SQL programming demanding situations.
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Additional info for Joe Celko's SQL for Smarties: Advanced SQL Programming Third Edition
Sample text
Each column has a specific data type and constraints that make up an implementation of an abstract domain. The way a table is physically implemented does not matter, because you only access it with SQL. The database engine handles all the details for you and you never worry about the internals, as you would with a physical file. In fact, almost no two SQL products use the same internal structures. SQL Server uses physically contiguous storage accessed by two kinds of indexes; Teradata uses hashing; Nucleus (SAND Technology) uses compressed bit vector; Informix and CA-Ingres use more than a dozen different kinds of indexes.
If each boy appears only once in the table, or each girl appears only once in the table, then each (boy_name, girl_name) pair can appear only once. However, the redundancy can be useful in searching the table, because it will probably create extra indexes that give us a covering of both names. The query engine then can use just the index and touch the base tables. The Moral Majority is pretty upset about this Hollywood scandal and would love for us to stop running around and settle down in nice stable couples.
If INITIALLY DEFERRED is specified, then the constraint has to be DEFERRABLE. 2. If INITIALLY IMMEDIATE is specified or implicit and neither DEFERRABLE nor NOT DEFERRABLE is specified, then NOT DEFERRABLE is implicit. 11 The transaction statement can then use the following statement to set the constraints as needed. ] This feature was new with full SQL-92, and it is not widely implemented in the smaller SQL products. In effect, they use 'NOT DEFERRABLE INITIALLY IMMEDIATE' on all the constraints.
Joe Celko's SQL for Smarties: Advanced SQL Programming Third Edition by Joe Celko
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