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As I said, I ll be discussing most of the items in the table in greater detail later in the book. However, the last three items, which are all related to character sets, are covered only briefly. The character sets, collations, and translations supported by RDBMSs can vary from product to product, and so can the implementation of these features. Throughout this book, the examples and projects I ll be giving you all rely on whatever the default character set is for the product that you re using. If you want to change that character set, either at the default level or at the database or table level, you should first carefully review the product documentation to find out what is supported and how those features are implemented.

The command can be called from within a batch file when, for example, you wish to map network drives before running the backup command. This also makes it easy to schedule the backup program to run via the AT or WinAT commands.

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menu item as the option Show Execution Plan. These items may have different names in other versions of Microsoft SQL Server. In SQL Server 2005, there does not appear to be a tool called SQL Query Analyzer, and it is not clear what the tool will be called when the product is formally released. In the Query Analyzer tool, the default mode is Object Browser. To display an execution plan, click the Display Estimated Execution Plan icon or press ctrl-l. The execution plan is displayed graphically as shown in Figure 11-1. Each step is shown as an icon and the number near the icon shows the percentage of the total query cost that applies to that step. You can place your cursor pointer over any icon to see a pop-up window showing more detailed information for that step.

Q: A:

Although complete backups will protect your Windows NT installations even in a worst-case scenario, it is often unnecessary to resort to formatting the hard drive, reinstalling the operating system, and then restoring from tape. The problem may be a corrupt Registry or some other minor problem, such as a corrupt boot file. Windows NT includes the ability to back up the essentials of your system configuration to an Emergency Rescue Disk (ERD) and use it to restore the system if there is some future problem. On a Windows NT computer, this information includes portions of the Registry, the Security database (including all user accounts and groups), and hard disk information. The Repair Disk Utility (RDISK) can be used to back up this data to a floppy:

You describe a domain as a user-defined object that is based on a data type but can include a default value and a constraint How does this type of domain differ from a domain as you describe it in the relational model In many ways the two are the same, and for all practical purposes, you can think of an SQL domain as a counterpart to a domain in the relational model There is one subtle difference, however a domain in the relational model is merely a description of the data that can be included in an attribute (column) associated with that particular domain An SQL domain, on the other hand, restricts the data that can be inserted into the column An SQL domain does this through the use of constraints, which are validation rules that are part of the system of data integrity.

Figure 11-1

The main idea to keep in mind is that a domain in the relational model is a logical concept, whereas an SQL domain is a physical one When you talk about schema objects, you mention base tables Does SQL support any other types of tables The SQL:2006 standard supports four types of tables: base tables, transient tables, derived tables, and viewed tables The base table is a type of table whose data is actually stored somewhere In other words, SQL data is stored in a base table A transient table is a named table that is implicitly created during the evaluation of a query expression or the execution of a trigger A derived table is the returned table that contains the result of a query (the set of data specific to the query).

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