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NOTE: The designers of Microsoft SQL Server have included one special datatype with the server sysname. It is used to control the length of Transact-SQL identifiers. When the server is working in default mode, the length of this type is set to 128 characters. When the compatibility level is set to 65 or 60, the length is shortened to 30 characters.

Variables in Transact-SQL are the equivalent of variables in other programming languages, but due to the nature of Transact-SQL language, their use and behavior are somewhat different. There are two types of variables in Transact-SQL:

4:

The major difference between the two types of variables is their scope. The scope of local variables is batch. This restriction implicitly includes a single stored procedure. It is a significant limitation. However, several workarounds can be used as solutions to this problem. A stored procedure cannot access variables defined in other stored procedures. One way to pass values to and from stored procedures is to use parameters. Keep in mind that you are passing only the values associated with the variables, not references as you can in some other programming languages. Another way to transfer value between stored procedures or between batches is the use of more permanent database objects such as tables or temporary tables. Let s review basic operations with local variables.

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The parameters are: server, login, password, destination of database files, and, optionally, the database name. Use the space character as a parameter delimiter. If you omit the last parameter, the program will script all nonsystem databases on the server. When scripting is finished, you will find database objects in the set of Create scripts in the folder named after the database (see Figure 11-6). The tool also creates deployment scripts. They contain Create scripts grouped by type. You will read more about them in the Deployment Scripts: Traditional Approach section, later in the chapter. It is true that the Generate SQL Scripts Wizard in Enterprise Manager will perform similar actions, but there are several significant differences: TbDbScript follows naming conventions used in Visual Studio. Generation does not require user intervention and therefore is less prone to errors. The resulting files are always the same. The script generates individual database object Create scripts and deployment scripts at the same time. You can also schedule usage of TbDbScript, which may be very useful when the development team is not using Visual SourceSafe religiously as when the team is making changes live to the development database. Every deployment script file begins with a Use database_name statement and they can even be deployed manually using Query Analyzer.

Before you can do anything with a local variable, you need to declare it. Declaration consists of the reserved word Declare and a list of variables followed by a datatype. The names of variables must comply with the rules for identifiers. Limitations include the following:

The name of the variable must begin with the at sign (@). The second character must not be an at sign (@). It can be any other character allowed for identifiers:

Declare @LastName varchar(50)

The row locators in nonclustered index leaf pages for a heap are pointers to the actual rows in which the data can be found, and these pointers consist of a Row ID (RID), which is a file number, a page number, and a row number on the page If the base table has a clustered index, the row locators in any nonclustered index leaf pages contain the clustered index key value for the row After reaching the leaf level in a nonclustered index, you can find the exact location of the data, though the page on which that data resides must still be separately retrieved Because you can access the data directly, you do not need to scan all the data pages for a qualifying row Better yet, in a clustered index, shown in Figure 2-4, the leaf level actually contains the data row, not simply the index key.

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