Inside Microsoft SQL Server 2008; T-SQL Querying by Itzik Ben-Gan

By Itzik Ben-Gan

Автор книги "SQL Server 2000 XML" подробно и во всех деталях описывает работу с базами данных SQL Server посредством XML документов. Изложение ведется "от простого к сложному", поэтому вначале издания рассматривается сам стандарт XML, затем уже описывается техника извлечения данных из базы с помощью средств FOR XML, обсуждаются возможности представления XML документов как реляционных наборов данных с помощью OPENXML. Автор уделяет внимание XDR и XSD схемам, мотивируя это как средство получения данных через HTTP запросы, использованию Xpath запросов к SQL Server, технологиям модификации баз данных через программы обновления. В книге рассматривается представление XML View в виде одного из средств описания таблиц СУБД. Описываются и практические задачи - демонстрируются техники импорта XML документов в базу данных с помощью программы массовой загрузки XML Bulk Load. Всего в издании five практических примеров, позволяющих убедиться в описанных в книге преимуществах использования XML технологий в работе с СУБД SQL Server 2000. Читатель найдет в издании преимущества и новые возможности релиза internet 2.0, при использовании которого можно организовать XML доступ к базам данных SQL Server 2000.

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Extra info for Inside Microsoft SQL Server 2008; T-SQL Querying

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Chapter 1 Logical Query Processing 33 Conclusion Understanding logical query processing phases and the unique aspects of SQL is important to get into the special mind set required to program in SQL. By being familiar with those aspects of the language, you can produce efficient solutions and explain your choices. Remember, the idea is to master the basics. Chapter 2 Set Theory and Predicate Logic Steve Kass This chapter contains a brief introduction to two cornerstones of mathematics: set theory and predicate logic, which are intimately connected to the world of databases.

Step 1-J3 returns the rows from VT1-J2, plus rows from the preserved table(s) for which a match was not found in step 1-J2. These added rows are referred to as outer rows. NULLs are assigned to the attributes (column values) of the nonpreserved table in the outer rows. As a result, virtual table VT1-J3 is generated. In our example, the preserved table is Customers: Customers AS C LEFT OUTER JOIN Orders AS O Only customer FISSA did not yield any matching orders (and thus wasn’t part of VT1-J2). Therefore, a row for FISSA is added to VT1-J2, with NULLs for the Orders attributes.

On the other hand, for UNIQUE constraints, set operators (such as UNION and EXCEPT), and sorting or grouping operations, NULLs are treated as equal: ■ You cannot insert into a table two rows with a NULL in a column that has a UNIQUE constraint defined on it. T-SQL violates the standard on this point. ■ A GROUP BY clause groups all NULLs into one group. ■ An ORDER BY clause sorts all NULLs together. ■ Set operators treat NULLs as equal when comparing rows from the two sets. In short, to spare yourself some grief it’s a good idea to be aware of the way UNKNOWN logical results and NULLs are treated in the different elements of the language.

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