By Ken Henderson
This can be a coder's publication. it really is meant to aid builders construct purposes that utilize Transact-SQL. it is not approximately database management or layout. it is not approximately end-user or GUI software improvement. it isn't even approximately server or database functionality tuning. it truly is approximately constructing the easiest Transact-SQL code attainable, whatever the program.
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This can be a coder's e-book. it truly is meant to assist builders construct purposes that utilize Transact-SQL. it isn't approximately database management or layout. it isn't approximately end-user or GUI program improvement. it isn't even approximately server or database functionality tuning. it is approximately constructing the simplest Transact-SQL code attainable, whatever the software.
Professional SQL Server 2008 Analytics presents every thing you must understand to strengthen refined and visually beautiful revenues and advertising dashboards utilizing SQL Server 2008 and to combine these dashboards with SharePoint, PerformancePoint, and different key Microsoft applied sciences. The booklet starts through addressing the numerous misconceptions that encompass using key functionality signs (KPIs) and giving a quick assessment of the company intelligence (BI) and reporting instruments that may be mixed at the Microsoft platform that will help you generate the consequences that you simply want.
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Resilient T-SQL code is code that's designed to final, and to be effectively reused by means of others. The objective of protecting database programming, the aim of this ebook, is that will help you to supply resilient T-SQL code that robustly and gracefully handles instances of accidental use, and is resilient to universal alterations to the database setting.
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Additional info for The Guru's Guide to Transact-SQL
To begin improving upon the stock function, let's first rewrite it as a stored procedure. Here's a stored procedure based on the O'Dell-Russell algorithm: USE master go IF OBJECT_ID('sp_soundex') IS NOT NULL DROP PROC sp_soundex go CREATE PROCEDURE sp_soundex @instring varchar(50), @soundex varchar(50)=NULL OUTPUT /* Object: sp_soundex Description: Returns the soundex of a string Usage: sp_soundex @instring=string to translate, @soundex OUTPUT=string in which to return soundex Returns: (None) Created by: Ken Henderson.
You can run the query above (like the other queries in this chapter, it's also on the accompanying CD) to see how xp_sscanf works. If you've used C's sscanf() function before, you'll be disappointed by the lack of functionality in the TransactSQL version. Many of the format parameters normally supported by sscanf( )— including width specifiers— 40 Chapter 2. Transact-SQL Data Type Nuances aren't supported, nor are data types other than strings. Nevertheless, for certain types of parsing, xp_sscanf can be very handy.
SOUNDEX(), by contrast, isn't quite so capable. Since it leaves "KN" unaltered, the string it ends up translating for both names is PKNM, thus returning the same soundex code for each of them. DIFFERENCE() A companion to SOUNDEX(), DIFFERENCE() returns an integer indicating the difference between the soundex values of two character strings. The value returned ranges from 0 to 4, with 4 indicating that the strings are identical. So, using the earlier example: SELECT DIFFERENCE('Terry', 'Terri') returns 4, while SELECT DIFFERENCE('Rodgers', 'Rogers') returns 3.
The Guru's Guide to Transact-SQL by Ken Henderson