Databases

Beginning T-SQL 2012 by Scott Shaw, Kathi Kellenberger (auth.)

By Scott Shaw, Kathi Kellenberger (auth.)

Beginning T-SQL 2012 is step one towards studying the T-SQL language that underlies Microsoft’s 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 good judgment embedded within the database within the kind of saved techniques and services. Beginning T-SQL 2012 starts off you at the route to getting to know T-SQL, with an emphasis on most sensible practices and sound coding techniques.

Beginning T-SQL 2012 begins with an creation to databases, normalization, and to SQL Server administration Studio. every one next bankruptcy teaches a side of T-SQL, development at the abilities realized in earlier chapters. workouts in every one bankruptcy provide readers a chance for the hands-on perform that ends up in real studying and distinguishes the powerfuble professional.

  • Imparts top practices for writing T-SQL
  • Helps you stay away from universal error
  • Shows the best way to write scalable code for solid functionality

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Employeej Go ahead an d execute the qu ery in Listin g 2-4. You sho uld see result s sim ilar to those in Figure 2-4. Notice th e column nam es in your res ults. The co lumn names are th e aliases th at you specified in your query. You ca n alias any colu m n, giving you com plete control over the h ead er s for your result sets. orks barisD Figure 2-4. The results ofusing aliases 40 CHAPTER2 • WRITINGSIMPLESELECT QUERIES The keyword AS is optional. You can specify an alias name immediately following a column name.

Once the download completes, open SQLServer Management Studio and start a new query. You can skip ahead in this chapter to see how this is done. In the query windows, execute the command shown in Listing I-I. You will need to change the path to match the location where you downloaded the AdventureWorks2012 data file. Figure 1-13 shows how your screen should look. Listing 1-1. l II • Messagesl File activation failu re . The physical f il e na e "C:\Advent ur eWO r ks 2BI 2_Dat a_ l og . l df " may be i nc orrect .

Each time a new application was entered into the database, a new Yes/No column for that application was created, and the data-entry form had to be modified. The developer, who should have know n better, told me that she just didn 't have time to create a properly norm alized database. Much m ore time was spent fighting with this poor design than wou ld have been spent properly designing the database. Understanding Indexes When a user runs a query to retrieve a portion ofthe rows from a tab le, how does the database engine determine which rows to return?

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