当需提取数据的汇总数或者排序数,但是又要显示非分组字段的字段时,可用统计函数\排序函数+OVER()【即开窗函数】例如:获取客户的所有订单同时显示客户的统计总订单数,不用开窗函数则脚本如下:SELECT [SalesOrderID] ,[OrderDate] ,[Customer...
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其他好文 时间:
2014-08-15 21:03:39
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271
The die is castInterGames is a high-tech startup company that specializes in developing technology that allows users to play games over the Internet.....
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其他好文 时间:
2014-08-15 12:16:38
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214
select cardno,planname,ROW_NUMBER() over(partition by cardno,planname order by createtime asc) as rowfrom CardAddrBlack即:将cardno,planname看作一个分组,以他们内部的...
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其他好文 时间:
2014-08-14 19:58:59
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140
1、需求,表 SYS_INFO 的 NAME 字段会重复,按照 创建时间CREATE_AT 字段,取最新一条,其他隐藏SELECT * FROM (SELECT T.*,ROW_NUMBER() OVER(PARTITION BY NAME ORDER BY CREATE_AT DESC) AS ....
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数据库 时间:
2014-08-14 13:38:18
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203
Description
Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by water for awhile and takes quite a long time to r...
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其他好文 时间:
2014-08-14 10:59:18
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265
引用自:http://cai555.javaeye.com/blog/466033方法1: with temp as ( select row_number() over(order by cityID) as rownum,cityName from city ) select * from te...
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数据库 时间:
2014-08-13 18:34:16
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243
在微软IP网络中,客户计算机查找其他计算机并与之进行通信的主要手段是利用域名(DNS)。但是,使用先前版本的Windows户机也使用NetBIOS协议,将名称解析为IP地址。通过三种方法解析NetBIOS名称为IP地址:在LMHOSTS文件中查找本地网段广播通过WINS服务器解析 Window...
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移动开发 时间:
2014-08-13 18:33:57
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210
iOS6之前 Required background modes
1.App plays audio
2.App registers for location updates
3.App provides Voice over IP services...
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移动开发 时间:
2014-08-13 01:19:04
阅读次数:
299
# CGI HTTP server
## Getting Started
Python 2.x is preferred to this simple demo. I'm using Python 2.7 over windows.
* https://docs.python.org/2.7/library/cgihttpserver.html
* https://do...
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编程语言 时间:
2014-08-13 01:09:54
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222
Phoenix(sql on hbase)简介
介绍:
Phoenix is a SQL skin over HBase delivered as a client-embedded JDBC driver targeting low latency queries over HBase data. Phoenix takes your SQL query, compile...
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数据库 时间:
2014-08-11 21:28:33
阅读次数:
589