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Inside this Book – Transact-SQL (T-SQL) is the main language used to manage and manipulate data in Microsoft SQL Server. This chapter lays the foundations for querying data by using T-SQL. The chapter describes the roots of this language, terminology, and the mindset you need to adopt when writing T-SQL code. It then moves on to describe one of the most important concepts you need to know about the language—logical query processing. Although this chapter doesn’t directly target specific exam objectives other than discussing the design of the SELECT statement, which is the main T-SQL statement used to query data, the rest of the chapters in this Training Kit do.
Inside this book –Training Kit Querying Microsoft SQL Server 2012 PDF Book by Itzik Ben gan – Observe the use of the two-part name to refer to the table. The first part (HR) is the schema name and the second part (Employees) is the table name. In some cases, T-SQL supports omitting the schema name, as in FROM Employees, in which case it uses an implicit schema name resolution process. It is considered a best practice to always explicitly indicate the schema name. This practice can prevent you from ending up with a schema name that you did not intend to be used, and can also remove the cost involved in the implicit resolution process, although this cost is minor. In the FROM clause, you can alias the queried tables with your chosen names. You can use the form <table> <alias>, as in HR.Employees E, or <table> AS <alias>, as in HR.Employees AS E. The latter form is more readable. When using aliases, the convention is to use short names, typically one letter that is somehow indicative of the queried table, like E for Employees. The reasons why you might want to alias tables become apparent in Chapter 4. For now, it’s sufficient for you to know that the language supports such table aliases and the syntax to assign them.
Training Kit Querying Microsoft SQL Server 2012 by Itzik Ben gan PDF : eBook Information
- Full Book Name – Training Kit Querying Microsoft SQL Server 2012
- Author of this Book – Itzik Ben gan
- Language – English
- Book Genre – Computer Science
- Download Format – PDF
- Size – 26 MB
- eBook Pages – 739
- Price – Free