By Forta B.
Sams educate your self Microsoft SQL Server T-SQL in 10 mins bargains simple, sensible solutions if you happen to want quickly effects. via operating via 10-minute classes, you will examine every little thing you must comprehend to use Microsoft SQL Server's TSQL language. this useful pocket advisor starts off with uncomplicated info retrieval and strikes directly to extra complicated issues, together with using joins, subqueries, complete text-based searches, features and kept techniques, cursors, triggers, desk constraints, XML, and lots more and plenty extra. you will examine what you want to comprehend methodically, systematically, and simply-in hugely concentrated classes designed to make you instantly and without problems effective. counsel indicate shortcuts and suggestions Cautions assist you keep away from universal pitfalls Notes clarify extra innovations, and supply more information 10 mins is all you want to how to: Use T-SQL within the Microsoft SQL Server setting build complicated T-SQL statements utilizing a number of clauses and operators filter out facts so that you get the data you wish quick Retrieve, style, and layout database contents subscribe to or extra comparable tables Make SQL Server give you the results you want withglobalization and localization Create subqueries to pinpoint your facts Automate your workload with triggers Create and change database tables paintings with perspectives, saved approaches, and extra sign up your ebook at samspublishing.com/register to obtain examples and resource code from this publication.
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Extra resources for Microsoft SQL Server T-SQL Crash Course
The only difference is that multiple column names must be specified after the SELECT keyword, and each column must be separated by a comma. TIP: Take Care with Commas When selecting multiple columns, be sure to specify a comma between each column name, but not after the last column name. Doing so will generate an error. LESSON 4: Retrieving Data 30 The following SELECT statement retrieves three columns from the products table: Input ▼ SELECT prod_id, prod_name, prod_price FROM products; Analysis ▼ Just as in the prior example, this statement uses the SELECT statement to retrieve data from the products table.
The solution is to use the DISTINCT keyword, which, as its name implies, instructs SQL Server to only return distinct values: Input ▼ SELECT DISTINCT vend_id FROM products; Limiting Results Analysis ▼ SELECT DISTINCT vend_id tells SQL Server to only return distinct (unique) vend_id rows, and therefore only four rows are returned, as shown in the following output. If used, the DISTINCT keyword must be placed directly in front of the column names. Output ▼ vend_id ----------1001 1002 1003 1005 CAUTION: Can’t Be Partially DISTINCT The DISTINCT keyword applies to all columns, not just the one it precedes.
First, a quick word about DBMS versions. The current version of SQL Server is SQL Server 2005 (although SQL Server 2000 and prior versions are in use in many organizations). This book was written for SQL Server 2005, with SQL Server 2000 in mind as well (although much of the content will apply to prior versions as well). TIP: Use Version 2005 If at all possible, the use of SQL Server 2005 is recommended. Not only will this make it possible for you to follow along with every lesson in this book (including two lessons specific to features introduced in SQL Server 2005), but you will also have the benefit of using a technically superior product, one that features vastly superior client tools.