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Using Additional Query Techniques
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SELECT p.FirstName, p.LastName, NTILE(2) OVER(PARTITION BY s.TerritoryID ORDER BY s.SalesYTD DESC) AS QuarterGroup, s.SalesYTD, s.TerritoryID FROM Sales.SalesPerson s INNER JOIN Person.Person p ON s.BusinessEntityID = p.BusinessEntityID INNER JOIN Person.BusinessEntityAddress ba ON p.BusinessEntityID = ba.BusinessEntityID INNER JOIN Person.Address a ON a.AddressID = ba.AddressID WHERE s.TerritoryID IS NOT NULL
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In addition to understanding the application of the four ranking functions, you need to understand when RANK/DENSE_RANK produce the same results as ROW_NUMBER, as well as what the difference is between RANK and DENSE_RANK.
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1. What is the difference between RANK and DENSE_RANK 2. When do ROW_NUMBER, RANK, and DENSE_RANK produce the same results
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1. RANK assigns the same number to ties but leaves a gap in the sequence
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corresponding to the number of rows that were tied. DENSE_RANK assigns the same number to ties but does not create a gap in a sequence.
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2. ROW_NUMBER, RANK, and DENSE_RANK produce the same results when the
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column being sorted by does not contain any duplicate values within the result set.
Pr actice
Finding Gaps in a Sequence
In this practice, you enhance the solution of the practice in Lesson 2, Implementing Subqueries, using ranking functions with a CTE to improve performance.
e xercise
In this exercise, you will enhance the solution of the practice in Lesson 2 using ranking functions with a CTE to improve performance.
Open a new query window, type and execute the following code to load a table with test data:
CREATE TABLE #orderdates (CustomerID OrderDate INT NOT NULL,
DATETIME NOT NULL);
Lesson 3: Applying Ranking Functions
DECLARE @startDate @endDate @CustomerID
datetime, datetime, int
SET @CustomerID = 1
WHILE @CustomerID < 100 BEGIN SELECT @startDate = 'Jan 01, 2007', @endDate = DATEADD(yy, 1, @startDate);
WITH dates AS (SELECT @startDate AS begindate UNION ALL SELECT DATEADD(dd,1,begindate) FROM dates WHERE begindate < dateadd(dd,-1,@endDate ) )
INSERT INTO #orderdates SELECT @CustomerID, begindate FROM dates OPTION (MAXRECURSION 0);
SET @CustomerID = @CustomerID + 1 END
SELECT * FROM #orderdates;
In the existing query window, type, highlight, and execute the following code to introduce gaps within the sequence:
--Now delete some of the rows to produce gaps DELETE #orderdates WHERE DATEDIFF(dd, 0, OrderDate)%11 = 0 ;
--Produce a couple of multi-day gaps DELETE FROM #orderdates WHERE OrderDate IN ('1/4/2007','2/17/2007') AND CustomerID%3 = 0
SELECT * FROM #orderdates;
In the existing query window, type, highlight, and execute the following code to retrieve a list of all the sequence gaps:
WITH OrderDatesCTE(CustomerID, RowNum, OrderDate) AS (SELECT CustomerID, ROW_NUMBER() OVER(PARTITION BY CustomerID ORDER BY OrderDate) AS RowNum, OrderDate FROM #orderdates)
SELECT a.CustomerID, DATEADD(dd, 1, a.OrderDate) AS StartGap,
Using Additional Query Techniques
DATEADD(dd, -1, b.OrderDate) AS EndGap, DATEDIFF(dd,DATEADD(dd, 1, a.OrderDate),DATEADD(dd, -1, b.OrderDate)) + 1 AS NumberMissingDays FROM OrderDatesCTE a INNER JOIN OrderDatesCTE b ON a.CustomerID = b.CustomerID and a.RowNum = b.RowNum - 1 WHERE DATEDIFF(dd, a.OrderDate, DATEADD(dd, -1, b.OrderDate)) <> 0 ORDER BY a.CustomerID, a.OrderDate
Lesson Summary
ROW_NUMBER is used to number rows sequentially in a result set but might not produce identical results if there are ties in the column(s) used for sorting. RANK numbers a tie with identical values but can produce gaps in a sequence. DENSE_RANK numbers ties with identical values but does not produce gaps in the sequence. NTILE allows you to divide a result set into approximately equal-sized groups.
Lesson 3: Applying Ranking Functions
chapter Review
To practice and reinforce the skills you learned in this chapter further, you can perform the following tasks:
n n n
Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involving the topics in this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.
Summary
Recursive CTEs can be used to solve a variety of problems that require traversal of a hierarchy more efficiently than cursor-based approaches. Subqueries allow you to embed one query within another query. A noncorrelated subquery is independent of the outer query, whereas a correlated subquery references columns in the outer query. Ranking functions can be used to solve a variety of problems that require ordering of a result set, such as pagination and finding gaps within a sequence.
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