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Notice that I explicitly specified column names in the query and didn t use SELECT * . Using SELECT * is a bad practice . In the future, the table might undergo schema changes that cause your application to break . Also, if you really need only a subset of the table s columns and not all of them, the use of SELECT * prevents the optimizer from utilizing covering indexes defined on that subset of columns . The query is missing a filter . This is not a bad practice by itself it s perfectly valid if you really need all rows from the table . But you might be surprised to learn that in performance-tuning projects at Solid Quality Mentors, we still find production applications that need filtered data but filter it only at the client . Such an approach introduces extreme pressure on both SQL Server and the network . Filters allow the optimizer to consider using indexes, which minimizes the I/O cost . Also, by filtering at the server, you reduce network traffic . If you need filtered data, make sure you filter it at the server; use a WHERE clause (or ON, HAVING where relevant)! Notice the use of a semicolon (;) to suffix statements . Although not a requirement of T-SQL for all statements, the semicolon suffix is an ANSI requirement . In SQL Server 2008, you are required to suffix some statements with a semicolon to avoid ambiguity

of your code . For example, the WITH keyword is used for different purposes to define a CTE, to specify a table hint, and so on . SQL Server requires you to suffix the statement preceding the CTE s WITH clause to avoid ambiguity . Similarly, the MERGE keyword is used for different purposes to specify a join hint and to start a MERGE statement . SQL Server requires you to terminate a MERGE statement with a semicolon to avoid ambiguity . Getting used to suffixing all statements with a semicolon is a good practice . Now let s get back to the focus of this section user-defined stored procedures . As I mentioned earlier, to invoke a user-defined stored procedure, you specify EXEC, the schema-qualified name of the procedure, and the parameter values for the invocation if there are any . References in the stored procedure to system and user object names that are not fully qualified (that is, without the database prefix) are always resolved in the database in which the procedure was created . If you want to invoke a user-defined procedure created in another database, you must database-qualify its name . For example, if you are connected to a database called db1 and want to invoke a stored procedure called dbo.Proc1, which resides in db2, you would use the following code:

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USE db1; EXEC db2.dbo.Proc1 <arguments>;

1 2 3 4

Because we specify useLinks=yes, our custom tag prints an HTML table consisting of four columns with links to buy and sell individual stocks. Setting currency=USD will print all stock prices in U.S. dollars.

Invoking a procedure from another database wouldn t change the fact that object names that are not fully qualified would be resolved in the database in which the procedure was created (db2, in this case) . If you want to invoke a remote stored procedure residing in another instance of SQL Server, you would use the fully qualified stored procedure name, including the linked server name: server.database.schema.proc . When done, run the following code for cleanup:

IF OBJECT_ID('dbo.GetSortedShippers', 'P') IS NOT NULL DROP PROC dbo.GetSortedShippers;

because you won t get any support if you run into trouble with it . Also, the behavior you get by marking your procedures as system isn t guaranteed to remain the same in future versions of SQL Server, or even future service packs . I m going to use it here for demonstration purposes to show additional behaviors that system procedures have .

Run the following code to mark the special procedure sp_Proc1 also as a system procedure:

The JSP that produces the U.S. English, HTML version of our page is shown in listing 5.4, with its British counterpart given in listing 5.5. Note both the

USE master; EXEC sp_MS_marksystemobject 'dbo.sp_Proc1';

If you now run sp_Proc1 in databases other than master, you will observe that all code statements within the stored procedure assume the context of the current database:

USE InsideTSQL2008; EXEC dbo.sp_Proc1; USE AdventureWorks2008; EXEC dbo.sp_Proc1; EXEC InsideTSQL2008.dbo.sp_Proc1;

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As a practice, avoid using the sp_ prefix for user-defined stored procedures . Remember that if a local database has a stored procedure with the same name and schema as a special procedure in master, the user-defined procedure will be invoked . To demonstrate this, create a procedure called sp_Proc1 in InsideTSQL2008 as well:

USE InsideTSQL2008; IF OBJECT_ID('dbo.sp_Proc1', 'P') IS NOT NULL DROP PROC dbo.sp_Proc1; GO CREATE PROC dbo.sp_Proc1 AS PRINT 'InsideTSQL2008.dbo.sp_Proc1 executing in ' + DB_NAME(); GO

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