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It is possible to define several variables in a single Declare statement. You just need to separate them with commas:

You can also define variables based on user-defined datatypes:

Figure 11-6

NOTE: You cannot define the null-ability of the variable, as you can with table columns. This does not mean that variables cannot contain null values. In fact, before assignment, the value of each variable is null. It is also possible to explicitly set the value of each variable to null.

There are several ways to assign a value to a local variable. Before SQL Server 7.0, the only way to do this was to use a modification of the Select statement:

Select @LastName = 'Smith'

It is also possible to assign several variables in the same statement:

Select @LastName = 'Smith', @FirstName = 'David', @BirthDate = '2/21/1965'

NOTE: It is necessary to assign a value of an appropriate datatype to the variable; however, there are some workarounds. In some cases, the server will perform an implicit conversion from one datatype to another. SQL Server includes a set of functions for this purpose. CONVERT and CAST can be used to change the datatype of the value (see 5).

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Now that Create scripts and deployment scripts are created, all you need to do is check them into the Visual SourceSafe database. You can do this manually with Visual SourceSafe Explorer or automatically with a little VBScript tool TbDir2Vss.vbs. You can download the tool from www.TrigonBlue.com/sqlxml/sqlxml_download.htm. To run it, you must use Windows Script Host and cscript.exe. You need to specify the location of the srcsafe.ini file, username, password, Visual SourceSafe project/ folder, and local folder:

Quite often, variables are assigned values from the resultset of the Select statement:

Select @Make = Equipment.make, @Model = Equipment.Model, @EqType = Equipment.EqType From EqType INNER JOIN Equipment ON EqType.EqTypeId = Equipment.EqTypeId Where EquipmentId = 2

4:

There are some potential problems associated with this approach. The question is: How will the server assign values if the resultset contains multiple records, or no records If more than one record is returned in the resultset, a variable will be assigned the values from the last record. The only trouble is that we cannot predict which record will be the last because this position depends on the index that the server uses to create the resultset. It is possible to create workarounds to exploit these facts (that is, to use hints to specify an index or use minimum and/or maximum functions to assign extreme values). The recommended solution, however, is to narrow the search criteria so that only one record is returned. The other behavior that might cause unexpected results is the case in which a resultset does not return any records. It is a common belief and expectation of many developers that the variable will be set to null. This is absolutely incorrect. The content of the variable will not be changed in this case. Observe the following example, or try to run it against the Asset database:

Declare @make varchar(50), @model varchar(50), @EqType varchar(50) Select @Make = 'ACME', @Model = 'Turbo', @EqType = 'cabadaster' Select @Make = make, @Model = Model, @EqType = EqType.EqType From EqType INNER JOIN Equipment ON EqType.EqTypeId = Equipment.EqTypeId Where EquipmentId = -1 Select @make make, @model model, @EqType EqType

A clustered index keeps the data in a table physically ordered around the key of the clustered index, while the leaf page of a clustered index is in fact the data page itself Because data can be physically ordered in only one way, only one clustered index can exist per table This makes the selection of the appropriate key value on which to cluster data an important performance consideration You can also use indexes to ensure the uniqueness of a particular key value In fact, the PRIMARY KEY and UNIQUE constraints on a column work by creating a unique index on the column s values The optimizer can use the knowledge that an index is unique in formulating an effective query plan..

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