4: Transact-SQL Primer in Visual Studio .NET

Creator QR Code in Visual Studio .NET 4: Transact-SQL Primer

4: Transact-SQL Primer
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SELECT Name, ProductNumber, StandardCost, ListPrice FROM ProductionProduct WHERE EXISTS (Select * FROM ProductionProduct WHERE ProductNumber Like '[A-C]%')
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Sometimes you want to guarantee the order of your result set For example, you may be retrieving a list of employees with their phone numbers To be able to easily find the right employee, it d make it a lot easier if the results were sorted by last name The only way to guarantee a sort order is with the ORDER BY clause By default, results are ordered in ascending order (lowest to highest) You can change this to descending order by adding the keyword DESC Most data types can be ordered In other words, I can order the results based on character data, date data, numerical data, and so on There are exceptions We cannot order results on these data types: ntext, text, image, and xml Columns in the ORDER BY clause don t have to be in the SELECT column list That is, we can sort on a column that doesn t appear in the result set The exception is if we use the DISTINCT clause to eliminate duplicate rows; in this case the column in the ORDER BY clause must be in the SELECT column list
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You can limit the rows in your result set when using the ORDER BY clause by including the TOP statement For example, if you want to retrieve the ten products with the highest prices, you could use this query:
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SELECT TOP 10 Name, ProductNumber, StandardCost, ListPrice FROM ProductionProduct ORDER BY ListPrice DESC
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In addition to limiting the rows to a set number, we can also limit the number of rows to a set percentage as in the following query Instead of getting 10 rows as we did in the previous query, this query gives us 51 rows (10 percent of the 504 total rows available)
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SELECT TOP 10 PERCENT Name, ProductNumber, StandardCost, ListPrice FROM ProductionProduct ORDER BY ListPrice DESC
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The collation can be set on a database, a table, a view, or a column Additionally, we can specify use of a collation in a SELECT statement with the ORDER BY clause by adding the COLLATE argument The benefit of using COLLATE in the ORDER BY clause is that we don t have to modify the underlying data to get the results we need For example, say you work in an international company based in New York with an SQL Server set with an SQL Latin1 CI collation You restore a database backup from a branch office in Lithuania using the defaults on your server What you ve done is modified the database by changing the collation from Lithuania CS (CS for case sensitive) in the original to Latin1 CI (CI for case insensitive) on your server If you run reports against
MCITP SQL Server 2005 Database Administration All-in-One Exam Guide
this database, the ORDER BY clause will perform differently on your server than it would on the server in Lithuania Can you fix this Of course By using the COLLATE argument in your ORDER BY clause, you can force the query to use the Lithuania CS collation in your query It doesn t change the underlying database, and it s much quicker than rebuilding the database with the proper collation Here s the syntax for including COLLATE in a SELECT statement:
SELECT TOP 10 Name, ProductNumber, StandardCost, ListPrice FROM ProductionProduct ORDER BY Name COLLATE SQL_Lithuanian_Cp1257_CS_AS
EXAM TIP If you look at the Books Online What s New in SQL Server 2005 article, you ll see that Microsoft has added several Database Engine International Enhancements While you may not work with complex languages such as Indic or Thai where the shapes of letters actually change depending on characters around them, Microsoft does expect you to know that the database engine supports multiple collations and that they can be set on several levels: server, database, table, view, column, and query In the following exercise, we ll incorporate the ORDER BY clause into a SELECT statement Exercise 44: Using the ORDER BY Clause 1 Open SSMS and create a New Query window 2 Create a listing of all employees and their phone numbers ordered by Last Name by entering and running the following query This will create the result set in ascending order
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