Hướng dẫn học Microsoft SQL Server 2008 part 136 pptx

... are the language of SQL Server PTO, which is why this part of the book begins with reading and interpreting the query execution plan. Viewing Query Execution Plans The SQL Server development team ... a .sqlplan file. Cool add! Examining plans using dynamic management views Dynamic management views, or DMVs, previously introduced with SQL Server 2005, provide an excel- lent window...

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... 1 Understanding SQL Server requires understanding T -SQL. The native language of the SQL Server engine is Transact -SQL. Every command sent to SQL Server must be a valid T -SQL command. Batches of stored T -SQL ... 3 The World of SQL Server IN THIS CHAPTER Why choose SQL Server? Understanding the core of SQL Server: the Relational Database Engine Approaching SQL Se...

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... example, instead of relating an assembly process between any part, the assembly relationship must now relate with multiple types of parts. 49 www.getcoolebook.com Nielsen c03.tex V4 - 07/21/2009 ... play before life became so busy. (You can listen to some of my MP3s on my ‘‘about’’ page on www.sqlserverbible.com.) There are some musicians who can hear a song and then play it; I’m not one of...

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... query looks at the entire row (or, more specifically, all the columns that participate in the union’s SELECT statements). SQL Server uses the ANSI Standard keyword EXCEPT to execute a difference union: SELECT ... 10 Summary Merging data is the heart of SQL, and it shows in the depth of relational algebra as well as the power and flexibility of SQL. From natural joins to exotic joins, SQL...

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... 54 91 2008 4 4 79 19 12 28 For the purposes of a GROUP BY, null values are considered equal to other nulls and are grouped together into a single result row. Grouping sets Normally, SQL Server ... column listed in the GROUP BY clause. Grouping sets is a variation of that theme that’s new for SQL Server 2008. With grouping sets, a summation row is generated for each unique value in...

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... ypes Traditionally, SQL Server stores both the date and the time in a single column using the datetime and smalldatetime data types, described in Table 20-4. With SQL Server 2008, Microsoft released ... to the data. Without indexes, SQL Server must scan and filter to select specific rows — a dog slow process at best. With the right indexes, SQL Server screams. SQL Server...

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... 07/23/2009 4:48pm Page 560 Part IV Developing with SQL Server What’s New with T -SQL Programming? M icrosoft has steadily enhanced Transact -SQL. SQL Server 7 saw unique identifiers, SQL Server 2000 added ... tune the server. To compensate, each full-featured database product must complement the SQL standard with some proprietary SQL language extension. Transact -SQL, bett...

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... 07/23/2009 4:48pm Page 562 Part IV Developing with SQL Server ■ An application can submit a T -SQL batch using ADO or ODBC for execution. ■ A SQL script may be executed by running the SQLCMD command-line ... space. The following example builds a list of departments in the AdventureWorks2008 sample database from the HumanResources.Department table: USE AdventureWorks2008; Declare @MAV...

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... is changed or SQL Server is reconfigured. The most common fatal errors are those caused by the following: ■ Data-type incompatibilities ■ Unavailable SQL Server resources ■ SQL Server advanced ... within ad hoc queries Executing stored procedures on linked SQL servers O f all the possible SQL Server bad practices, I believe the worst is ad hoc SQL. The solution: stored proce...

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... introduced in SQL Server 2000. If you’re upgrading to SQL Server 2008 directly from SQL Server 2000, then it’s worth knowing that the APPLY keyword, covered later in this chapter, was added in SQL Server ... result set S QL Server 2000 introduced user-defined functions (UDFs), and the SQL Server community was initially slow to adopt them. Nevertheless, UDFs were my pers...

Ngày tải lên: 04/07/2014, 09:20