By Kathi Kellenberger, Scott Shaw
Starting T-SQL is a performance-oriented creation to the T-SQL language underlying the Microsoft SQL Server database engine. T-SQL is vital in writing SQL statements to get info into and out of a database. T-SQL is the root for enterprise common sense embedded within the database within the type of kept methods and capabilities. starting T-SQL starts off you at the route to studying T-SQL, with an emphasis on best-practices and sound coding thoughts resulting in very good functionality. This new version is up-to-date to hide the basic positive factors of T-SQL present in SQL Server 2014, 2012, and 2008.
Beginning T-SQL starts off with an creation to databases, normalization, and to SQL Server administration Studio. consciousness is given to Azure SQL Database and the way to connect with distant databases within the cloud. each one next bankruptcy teaches a facet of T-SQL, construction at the talents discovered in prior chapters. workouts in so much chapters provide a chance for the hands-on perform that results in precise studying and distinguishes the useful expert. very important innovations akin to windowing capabilities are lined to aid write quickly executing queries that clear up genuine enterprise problems.
A stand-out function during this publication is that almost all chapters finish with a "Thinking approximately Performance" part. those sections disguise points of question functionality relative to the content material simply awarded. They'll assist you stay away from newbie errors by way of understanding approximately and puzzling over functionality from Day 1.
* Imparts top practices for writing T-SQL
* is helping you keep away from universal errors
* exhibits how one can write scalable code for reliable functionality
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Starting T-SQL is a performance-oriented creation to the T-SQL language underlying the Microsoft SQL Server database engine. T-SQL is key in writing SQL statements to get info into and out of a database. T-SQL is the basis for enterprise good judgment embedded within the database within the kind of kept methods and capabilities.
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Extra info for Beginning T-SQL (3rd Edition)
Expand Tables. ” Then type in the WHERE clause. [ProductCostHistory] WHERE StandardCost BETWEEN 10 and 13; GO 4. Rewrite the query you wrote in question 1, changing it so that the employees who do not have the title Research and Development Engineer are displayed. Employee WHERE JobTitle <> 'Research and Development Engineer'; 5. Explain why a WHERE clause should be used in many of your T-SQL queries. Most of the time the application or report will not require all the rows. The query should be filtered to include only the required rows to cut down on network traffic and increase SQL Server performance because returning a smaller number of rows is usually more efficient.
Statements Returning Literal Values SELECT 1; SELECT 'ABC'; After typing the code in the query window, press F5 or click Execute to run the code. You will see the results displayed in two windows at the bottom of the screen, as shown in Figure 3-1. Because you just ran two statements, two sets of results are displayed. Figure 3-1. The results of running your first T-SQL statements N Tip By highlighting one or more statements in the query window, you can run just a portion of the code. For example, you may want to run one statement at a time.
You can then find the results, if any, by clicking the Results tab. Retrieving from a Table You will usually want to retrieve data from a table instead of literal values. After all, if you already know what value you want, you probably don’t need to execute a query to get that value. In preparation for retrieving data from a table, either delete the current code or open a new query window. Change to the example database by typing Use AdventureWorks and executing or by selecting the AdventureWorks database from the drop-down list, as shown in Figure 3-2.
Beginning T-SQL (3rd Edition) by Kathi Kellenberger, Scott Shaw