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This global variable is the foundation of all methods for error handling in the Microsoft SQL Server environment. It is essential to examine the value of this variable before any other Transact-SQL statement is completed because the value of the @@error will be reset. Even if the statement is only a simple Select statement, the value of the @@error variable will be changed after it. In the following example, let s assume that an error will occur during the Update statement. @@error will contain the error code only until the next statement is executed; even the command for reading the @@error value will reset it. If it was completed successfully, SQL Server will set @@error to 0. The only way to preserve the @@error

value is to immediately read it and store it in a local variable. Then it can be used for error handling.

If it is necessary to read more than one global variable immediately after a statement, all such variables should be included in a single Select statement:

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Views can be a very useful tool for managing very large databases (VLDBs). Typically, data warehouse systems contain huge volumes of uniform data. A textbook example is a retailer that collects information about sales over years. Some analyses would process many years of data, but others would focus on only a few months or the current year. If everything were in a single table, queries and management of data would become increasingly difficult. In such a scenario, the retailer s sales information would be split into several horizontally partitioned tables such as OrderItem2000, OrderItem2001, and OrderItem2002. For analyses (queries) that span all tables, you can create a view that puts them all together:

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

The @@error variable will be set to an error number only in the case of errors, not in the case of warnings. Supplementary information that the server posts regarding errors or warnings (that is, severity, state, and error messages) are not available inside a stored procedure or a batch. Only the error number is accessible from a stored procedure or a batch. Further components of error messages can be read only from the client application. You will find more details about use of the @@error function in the section about error handling in 7.

After each Transact-SQL statement, the server sets the value of this variable to the total number of records affected by it. It can be used to verify the success of selected operations.

select Make, Model, EqTypeid into OldEquipment from Equipment where EqTypeid = 2 if @@rowcount = 0 Print "No rows were copied!"

4:

can work together to perform tasks, the addition of even a single processor can tremendously increase the efficiency of your server. Since processor development moves very quickly, you should evaluate your choices at the time of purchase and take into account factors such as performance, cost, and the availability of compatible processors based on that architecture. Become aware of hardware ability and cost well before the time to purchase arrives. Combining multiple processors at lower levels can sometimes be just as or more effective than a faster processor, and may actually cost less. Now that you know the type of processors that SQL Server can function on, you will probably want to become familiar with some of the other hardware requirements. Understanding the minimum levels of acceptable hardware are, after all, vital to creating a successful server. As always, research and planning are the keys to making certain that the server you purchased is right for your environment.

Create View vOrderItem as select * from OrderItem2000 UNION ALL select * from OrderItem2001 UNION ALL select * from OrderItem2002

NOTE: Certain statements (like the if statement) will set @@arowcount to 0, and certain statements (like Declare) will not affect it.

ROWCOUNT_BIG is a function introduced in SQL Server 2000. It returns the number of affected records in the form of a bigint number.

TIP: When you try to update an individual record, SQL Server will not report an error if your Where clause specifies a criterion that does not qualify any (or qualifies too many) records. SQL Server will not update anything, and you might, for example, think that the operation was successful. You can use @@rowcount to identify such cases.

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