1. SQL 2005 - The ranking functions

2. The ranking functions – Step 1
USE tempdb;
GO
IF OBJECT_ID('dbo.Orders') IS NOT NULL
DROP TABLE dbo.Orders;
GO

3. The ranking functions – Step 2
CREATE TABLE dbo.Orders
( orderid INT NOT NULL,
orderdate DATETIME NOT NULL,
empid INT NOT NULL,
custid VARCHAR(5) NOT NULL,
qty INT NOT NULL,
CONSTRAINT PK_Orders PRIMARY KEY
NONCLUSTERED(orderid)
);

4. The ranking functions – Step 3
CREATE UNIQUE CLUSTERED INDEX
idx_UC_orderdate_orderid
ON dbo.Orders(orderdate, orderid);

5. The ranking functions – Step 4
SET NOCOUNT ON;
INSERT INTO dbo.Orders(orderid, orderdate, empid, custid, qty)
VALUES(30001, '20030802', 3, 'B', 10);
INSERT INTO dbo.Orders(orderid, orderdate, empid, custid, qty)
VALUES(10001, '20031224', 1, 'C', 10);
INSERT INTO dbo.Orders(orderid, orderdate, empid, custid, qty)
VALUES(10005, '20031224', 1, 'A', 30);
INSERT INTO dbo.Orders(orderid, orderdate, empid, custid, qty)
VALUES(40001, '20040109', 4, 'A', 40);
INSERT INTO dbo.Orders(orderid, orderdate, empid, custid, qty)
VALUES(10006, '20040118', 1, 'C', 10);

6. The ranking functions – Step 5
-- Analytical Ranking Functions
–- without PARTITION BY clause
SELECT orderid, qty,
ROW_NUMBER() OVER(ORDER BY qty) AS rownum,
RANK() OVER(ORDER BY qty) AS rnk,
DENSE_RANK() OVER(ORDER BY qty) AS densernk,
NTILE(4) OVER(ORDER BY qty) AS ntile4
FROM dbo.Orders
ORDER BY qty;
GO

7. The ranking function - Output
Ordered Qty Rownum Rnk Densernk Ntile4
30001 10 1 1 1 1
10001 10 2 1 1 1
10006 10 3 1 1 2
10005 30 4 4 2 3
40001 40 5 5 3 4