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Solutions based on this stored procedure are better than solutions based on the execution of a character string. The latter are not reused very often. It might happen that they will be reused only when parameter values also match. Even in a situation where we are changing the structure of a query, there are a finite number of possible combinations of query parameters (and some of them are more probable then others). Therefore, reuse will be much more frequent if you force parameterization using sp_executesql. When you use Execute, the complete batch has to be assembled in the form of a string each time. This requirement also takes time. If you are using sp_executesql, the batch will be assembled only the first time. All subsequent executions can use the same string and supply an additional set of parameters. Parameters that are passed to sp_executesql do not have to be converted to characters. That time is wasted when you are using Execute. By using them in their native format in sp_executesql, you may be able to detect errors more easily.

SQL Server 7.0 and SQL Server 2000 documentation, Microsoft refers to them as scalar functions, meaning that they return just one value. Since you can still find references to global variables in some documentation, and since we would like to use some of them in this chapter, we will review them both here and in the next chapter, which is dedicated to functions. Global variable names begin with an @@ prefix. You do not need to declare them, since the server constantly maintains them. Let s review the principal global variables.

Indexed views typically improve the performance of data warehouse systems and other systems that predominantly have queries that read data. On the other hand,

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This is a function or global variable that you will use frequently. It is also a feature that generates many of the questions on Usenet newsgroups. One column in each table can be defined as the identity column, and the server will automatically generate a unique value in it. This is a standard technique in Microsoft SQL Server for generating surrogate keys (keys whose values are just numbers and do not carry any information). Usually, such columns will be set to assign sequential numbers:

Create table Eq (EqId int identity(1,1), Make varchar(50), Model varchar(50), EqTypeId int)

The @@identity global variable will allow the user to find out which value was generated by the server. It is important to read the value as soon as possible (that is, in the next Transact-SQL statement). Otherwise, it might happen that you initiate, for example, another stored procedure or a trigger that inserts a record to a different table with an identity column. In such a case, SQL Server overwrites the number stored in @@identity with the new value. In the following example, a record will be inserted and a new identifier will immediately be read:

4:

1:

Declare @intEqId int Insert into Eq(Make, Model, EqTypeId) Values ('ACME', 'Turbo', 2) Select @intEqId = @@identity

If one Transact-SQL statement inserts several records into a table with an identity column, @@identity will be set to the value from the last record:

indexed views can reduce the performance of OLTP systems. Updates to an indexed view become part of transactions that modify the base tables. This fact may increase the cost of OLTP transactions and offset the savings achieved on read operations.

Declare @intEqId int Insert into Equipment(Make, Model, EqTypeId) Select Make, Model, EqTypeID From NewEquipment Select @intEqId = @@identity

You will use this function very often. One of the most common types of stored procedures that you will write will just insert a record and return its new key to the caller.

After each Transact-SQL statement, the server sets the value of this variable to an integer value:

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