Figure 4-21 A partial RANK result set in VS .NET

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Figure 4-21 A partial RANK result set
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4: Transact-SQL
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3 For comparison s sake, let s use this same query for each of the ranking functions Add the bolded statements listed in the following code segment to your previous code and execute it
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SELECT CustomerID, SalesOrderID, SubTotal, DENSE_RANK() OVER(ORDER BY SubTotal DESC) AS Dense_Rank, ROW_NUMBER() OVER(ORDER BY SubTotal DESC) AS Row_Number, NTILE(10) OVER(ORDER BY SubTotal DESC) AS NTile, RANK() OVER(ORDER BY SubTotal DESC) AS Rank FROM SalesSalesOrderHeader WHERE CustomerID IN (599, 514, 638, 72) ORDER BY SubTotal Desc
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Your code should look similar to Figure 4-22
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Figure 4-22 Partial output of the different ranking functions
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4 The previous code snippets omitted the PARTITION BY clause, resulting in the ranking function being applied to the entire result set In the following code, we ll add the PARTITION BY clause to partition the result set by the CustomerID The bolded text shows what has changed from the first query
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SELECT CustomerID, SalesOrderID, SubTotal, RANK() OVER(PARTITION BY CustomerID ORDER BY SubTotal DESC) AS Rank FROM SalesSalesOrderHeader WHERE CustomerID IN (599, 514, 638, 72) ORDER BY CustomerID
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Notice that this query ranks the invoices on a per-customer basis since we have partitioned the output by customer Your display should look similar to Figure 4-23
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Figure 4-23 A partial listing of ranking function with the PARTITION BY clause
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MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
Review
In this chapter, we presented some basics on Transact-SQL and then added in some advanced query techniques We covered the SELECT statement, adding the WHERE clause to filter the data, the ORDER BY clause to guarantee a sort order, the GROUP BY and HAVING classes to provide summary data, and the various JOIN clauses to combine data from multiple tables We covered the other DML statements INSERT, UPDATE, and DELETE For those readers preparing to take the 70-442 test, we also covered some advanced query techniques using common table expressions, EXCEPT and INTERSECT, PIVOT and UNPIVOT, and ranking functions
Additional Study
Self Study Exercises
Write a SELECT statement that retrieves a listing of all employees in AdventureWorks and includes their first and last names Use aliases for the table names Write a SELECT statement that includes all employees hired in the year 2001, ordered by Last Name from Z to A Write a SELECT statement retrieving a list of all employees with birthdays in the next month List the employees by name Rewrite the following statement into an ANSI-compliant statement:
SELECT eLastName, eFirstName, aCity, aStateEmployeeID FROM Employee e, Address a WHERE eEmployeeID *= aEmployeeID
Add yourself as an employee using appropriate INSERT statements Note that this requires an entry into the Contact table Change the last name of Ms Kim Abercrombie to Ziemba with an UPDATE statement Use the DELETE statement to remove your record as a contact in AdventureWorks Create a hierarchical result set from a query showing who works for whom in the AdventureWorks company Use the Employee and Department tables Write a query to list all employees by name, omitting any employees that don t have e-mail addresses listed in the database Working with Collations SELECT Clause (Transact-SQL)
BOL Topics
4: Transact-SQL
Search Condition (Transact-SQL) LIKE (Transact-SQL) ORDER BY Clause (Transact-SQL) COLLATE (Transact-SQL) GROUP BY (Transact-SQL) Join Fundamentals CAST and CONVERT (Transact-SQL) UPDATE (Transact-SQL) INSERT (Transact-SQL) DELETE (Transact-SQL) Recursive Queries Using Common Table Expressions Ranking Functions (Transact-SQL) Using PIVOT and UNPIVOT EXCEPT and INTERSECT (Transact-SQL)
Summary of What You Need to Know
70-431 When preparing for the 70-431 test, you need to be very proficient with T-SQL This includes:
Using and interpreting SELECT statements Using and interpreting other DML statements Using aliases Using Group By and Having statements
You should know how to work with transactions, including:
BEGIN TRANSACTION COMMIT TRANSACTION ROLLBACK TRANSACTION
You should be familiar with TRY CATCH statements and how to catch errors within a T-SQL script 70-441 Topics for the 70-441 test aren t included in this chapter
MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
70-442 When preparing for the 70-442 test, you must be thoroughly familiar with Transact-SQL statements This includes both basic and advanced techniques Expect to see complex T-SQL statements that must be analyzed and then either corrected or optimized Keywords you should know include:
SELECT WHERE NULL ORDER BY (including TOP) GROUP BY (including Having) CUBE PIVOT and UNPIVOT EXCEPT and INTERSECT WITH (common table expressions, including recursive common table expressions) RANK
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