By Ben Forta

Sams train your self Microsoft SQL Server T-SQL in 10 mins deals uncomplicated, functional solutions if you desire speedy effects. by means of operating via 10-minute classes, you’ll study every thing you must be aware of to exploit Microsoft SQL Server’s T-SQL language.   this convenient pocket advisor begins with basic information retrieval and strikes directly to extra advanced subject matters, together with using joins, subqueries, complete text-based searches, features and saved approaches, cursors, triggers, desk constraints, XML, and lots more and plenty extra.   You’ll study what you want to be aware of methodically, systematically, and simply–in hugely targeted classes designed to make you instantly and without problems effective.   counsel indicate shortcuts and recommendations   Cautions assist you stay away from universal pitfalls   Notes clarify extra thoughts, and supply additional info   10 mins is all you want to easy methods to… Use T-SQL within the Microsoft SQL Server atmosphere build complicated T-SQL statements utilizing a number of clauses and operators clear out info so that you get the data you would like quick Retrieve, type, and structure database contents sign up for or extra similar tables Make SQL Server give you the results you want with globalization and localization Create subqueries to pinpoint your information Automate your workload with triggers Create and change database tables paintings with perspectives, kept tactics, and extra  Register your publication at www.samspublishing.com/register to obtain examples and resource code from this booklet.

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Even though use of wildcards might save you the time and effort needed to list the desired columns explicitly, retrieving unnecessary columns usually slows down the performance of your retrieval and your application. TIP: Retrieving Unknown Columns There is one big advantage to using wildcards. Because you do not explicitly specify column names (because the asterisk retrieves every column), it is possible to retrieve columns whose names are unknown. 32 LESSON 4: Retrieving Data Retrieving Distinct Rows As you have seen, SELECT returns all matched rows.

CAUTION: Position of the ORDER BY Clause When specifying an ORDER BY clause, be sure that it is after the FROM clause. Using clauses out of order will generate an error message. Summary In this lesson, you learned how to sort retrieved data using the SELECT statement’s ORDER BY clause. This clause, which must be the last in the SELECT statement, can be used to sort data on one or more columns, as needed. 43 This page intentionally left blank LESSON 6 Filtering Data In this lesson, you will learn how to use the SELECT statement’s WHERE clause to specify search conditions.

As a rule, this practice is strongly discouraged. DBMSs are optimized to perform filtering quickly and efficiently. Making the client application (or development language) do the database’s job dramatically impacts application performance and creates applications that cannot scale properly. In addition, if data is filtered at the client, the server has to send unneeded data across the network connections, resulting in a waste of network bandwidth resources. CAUTION: WHERE Clause Position When using both ORDER BY and WHERE clauses, make sure ORDER BY comes after WHERE; otherwise, an error will be generated.

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