----------------------------汇总数据-----------------------------聚集函数用来汇总数据。由多种方法来返回所需的结果,高效,快速获得结果;--37.返回products表中所有产品的平均价格SELECTAVG(prod_price)ASavg_priceFROMproducts--38.返回products表中供应商ID=1003所有..
分类:
数据库 时间:
2015-10-13 19:31:26
阅读次数:
253
global和local变量虽然简单,但是还是记录一下,主要是转载转载自:http://blog.sina.com.cn/s/blog_436992740102ux8z.html先看一段代码:可见 old_price 是个全局变量, final_price 是局部变量运行结果是:局部变量拿到外面来如...
分类:
编程语言 时间:
2015-10-12 18:53:05
阅读次数:
350
题目:Say you have an array for which theithelement is the price of a given stock on dayi.If you were only permitted to complete at most one transaction ...
分类:
其他好文 时间:
2015-10-12 14:17:49
阅读次数:
169
Problem Description:Say you have an array for which theithelement is the price of a given stock on dayi.Design an algorithm to find the maximum profit...
分类:
其他好文 时间:
2015-10-11 12:46:28
阅读次数:
158
问题描述:本题用到下面三个关系表:CARD 借书卡: CNO 卡号,NAME 姓名,CLASS 班级BOOKS 图书: BNO 书号,BNAME 书名,AUTHOR 作者,PRICE 单价,QUANTITY 库存册数BORROW 借书记录: CNO 借书卡号,BNO 书号,RDATE 还书日期备注:...
分类:
数据库 时间:
2015-10-10 17:11:36
阅读次数:
1203
Description:Say you have an array for which theithelement is the price of a given stock on dayi.Design an algorithm to find the maximum profit. You ma...
分类:
其他好文 时间:
2015-10-08 19:53:47
阅读次数:
130
找到lib_goods.php第147行,代码$sql = 'SELECT g.goods_id, g.goods_name, g.shop_price,g.goods_thumb, SUM(og.goods_number) as goods_number ' .1.替换一下代码$sql = 'SE...
分类:
其他好文 时间:
2015-10-08 18:06:46
阅读次数:
141
oracle当多表union时遇到nvarchar2类型时报错 字符集不匹配对使用nvarchar的地方,加上 to_char( nvarchar 的变量或字段 )如:select to_char(name),price from aaunion allselect to_char(name),pr...
分类:
数据库 时间:
2015-10-08 16:33:17
阅读次数:
155
Description:Say you have an array for which theithelement is the price of a given stock on dayi.If you were only permitted to complete at most one tra...
分类:
其他好文 时间:
2015-10-08 00:29:17
阅读次数:
167
10.1 Imagine you are building some sort of service that will be called by up to 1000 client applications to get simple end-of-day stock price informat...
分类:
其他好文 时间:
2015-10-02 07:53:54
阅读次数:
217