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博客园 - 绿水青山

关于nginx承载php时,页为为空白的问题 问题总结 Windows/Linux 生成iOS证书及p12文件 aws supported language mysql导入导出 .net core注入时作用域的说明 Attempt to fetch logical page (1:8019) in database 5 failed. It belongs to allocation unit 720575947 sas…… SQL2012删除作业失败的处理 使用JavaScript打印网页指定DIV区域 WlN7下硬盘安装WINXP Could not load file or assembly 'Microsoft.ReportViewer.Common, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its depe SSRS中错误:为用户“NT AUTHORITY\NETWORK SERVICE”授予的权限不足,无法执行此操作。 (rsAccessDenied)解决方案 - 绿水青山 U盘安装xp 数字签名 SQL无法连接问题 div在父容器中水平垂直居中 SQL2008自定义聚合函数 error:unknow filesystem iis出现-2145318902错误
SQL使用开窗函数与CTE查询每月销售额的前几名
绿水青山 · 2014-03-07 · via 博客园 - 绿水青山
WITH tagTab AS(
SELECT YearMonth, 
pm=RANK() OVER(PARTITION BY YearMonth ORDER BY amount DESC) 
FROM SaleTab
)
SELECT * FROM tagTab WHERE pm<=5

 开窗函数:

http://technet.microsoft.com/zh-cn/library/ms189461(v=sql.105).aspx

posted on 2014-03-07 15:28  绿水青山  阅读(518)  评论(0)    收藏  举报

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