SQL语句

--利用子查询指定返回范围的查询

USE AdventureWorks

select * from (

SELECT PSC.Name Category,p.Name Product,p.ListPrice, 

ROW_NUMBER() OVER(ORDER BY PSC.Name,P.ListPrice DESC) AS RowNum

FROM Production.Product p

JOIN Production.ProductSubCategory PSC

ON p.ProductSubCategoryID=PSC.ProductSubCategoryID

) orderdata

where RowNum between 25 and 30

--通过ROW_NUMBER函数搭配子查询完成数据分页

CREATE PROC spGetPages2 @iRowCount INT,@iPageNo INT

AS

SELECT * FROM (

SELECT ROW_NUMBER() OVER(ORDER BY ProductID ASC) RowNum,

		* FROM Production.Product ) OrderData

WHERE RowNum BETWEEN @iRowCount*(@iPageNo-1)+1 AND @iRowCount*@iPageNo

ORDER BY ProductID ASC

GO

EXEC spGetPages2 10,20

--删除表中重复行

SELECT ProductID+0 ProductID, Name 

	INTO myPD03

FROM AdventureWorks.Production.Product

--

SET NOCOUNT ON

DECLARE @CNT INT

SET @CNT =1

WHILE @CNT<2001

BEGIN

	INSERT myPD03

	SELECT ProductID, Name 

	FROM AdventureWorks.Production.Product

	SET @CNT =@CNT+1

END

-- 

SELECT * FROM myPD03

ORDER BY ProductID;

-- 

WITH Dups AS

(

  SELECT *, 

    ROW_NUMBER() OVER(PARTITION BY ProductID ORDER BY ProductID) AS RN

  FROM dbo.myPD03

)

DELETE FROM Dups WHERE RN > 1;