In the example below, we order first by last_name, and then, in cases where an employee’s last name is the same as someone else's, we’ll order by their first name (first_name). SELECT e.first_name, e.last_name
WHERE RowNumber BETWEEN 50 AND 60; C. Using ROW_NUMBER() with PARTITION The following example shows using theROW_NUMBERfunction with thePARTITION BYargument. Copy SELECT FirstName, LastName, ROW_NUMBER() OVER(PARTITION BY PostalCode ORDER BY SalesYTD DESC) AS 'Row Number', SalesYTD, PostalCo...
SELECT SalesOrderID, OrderDate, ROW_NUMBER() OVER (ORDER BY OrderDate) AS 'RowNumber' FROM Sales.SalesOrderHeader ) SELECT * FROM OrderedOrders WHERE RowNumber BETWEEN 50 AND 60; C. Using ROW_NUMBER() with PARTITION The following example shows using theROW_NUMBERfunction with thePARTITION BY...
ROW_NUMBER() OVER (ORDER BY OrderDate) AS 'RowNumber' FROM Sales.SalesOrderHeader ) SELECT * FROM OrderedOrders WHERE RowNumber BETWEEN 50 AND 60; The following example shows using thePARTITION BYargument. USE AdventureWorks; GO SELECT c.FirstName, c.LastName ,ROW_NUMBER() OVER (PARTITION ...
A. Returning the row number for salespeople The following example calculates a row number for the salespeople in Adventure Works Cycles based on their year-to-date sales ranking. Copy USE AdventureWorks2012; GO SELECT ROW_NUMBER() OVER(ORDER BY SalesYTD DESC) AS Row, FirstName, LastName, ...
B. Returning the row number for salespeople The following example calculates a row number for the salespeople in Adventure Works Cycles based on their year-to-date sales ranking. SQL USEAdventureWorks2022; GOSELECTROW_NUMBER()OVER(ORDERBYSalesYTDDESC)ASRow, FirstName, LastName,ROUND(SalesYTD,2,...
ROW_NUMBER():此函数为分区中的每一行分配一个唯一的序列号。ROW_NUMBER() 函数的语法为: SELECT column1, column2, ..., ROW_NUMBER() OVER (ORDER BY column1) AS row_num FROM table_name; 此查询将返回一个结果集,其中包含一个附加列“row_num”,该列包含根据“column1”的顺序分配给每行的序列号...
WITHRankedOrdersAS(SELECTorder_id,customer_id,order_date,total_amount,ROW_NUMBER()OVER(PARTITIONBYcustomer_idORDERBYorder_date)ASrow_numFROMorders)SELECTcustomer_id,order_id,order_date,total_amountFROMRankedOrdersWHERErow_num<=2; 这些示例只是SQL数据分析的入门,你可以根据具体的需求进一步深入研究和分析...
C. Using ROW_NUMBER() with PARTITION The following example shows using the ROW_NUMBER function with the PARTITION BY argument. Copy SELECT FirstName, LastName, ROW_NUMBER() OVER(PARTITION BY PostalCode ORDER BY SalesYTD DESC) AS "Row Number", SalesYTD, PostalCode FROM Sales.vSalesPerson WHERE...
Foreachrowreturnedbyaquery,theROWNUMpseudocolumnreturnsanumberindicatingtheorderinwhichOracleselectstherowfromatableorsetofjoinedrows.ThefirstrowselectedhasaROWNUMof1,thesecondhas2,andsoon.ROWNUM伪列为每个查询返回的行提供一个值，这个值反映了表查询或者连接的行出现的先后顺序。查到的第一行rownum为1，第二...