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行处理——运算
pandas求和column_list = ['Fiber_TD_(g)', 'Sugar_Tot_(g)']# Let's sum up the total amount of fiber and sugar across all the foods.total = food_info[colum...
分类:其他好文   时间:2016-01-14 00:53:17    阅读次数:162
php工作笔记8-并发和数据类型
1、mysql在进行数据的修改时,并发情况下: $RoundsRows=$modelRounds->where("id=$roundsID and (sendMoney + $amount setInc('SendMoney',$amount);2、在mysql事务中,会有幻读,在事务中可以并发读,...
分类:Web程序   时间:2016-01-13 12:18:48    阅读次数:213
1327-Undeclared variable:amount
1、错误描述2、错误原因BEGIN SELECT stuAge INTO amount; IF stuAge IS NOT NULL THEN SET stuAge = stuAge + 1; SELECT stuAge INTO amount1; ELSE SELECT 20 INTO amount2; END IF; SELECT stuAge INTO amou...
分类:其他好文   时间:2016-01-11 20:30:03    阅读次数:299
[ACM] ural 1057 Amount of degrees (数位统计)
1057. Amount of DegreesTime limit: 1.0 secondMemory limit: 64 MBCreate a code to determine the amount of integers, lying in the set [X;Y] and being a ...
分类:其他好文   时间:2016-01-10 11:48:10    阅读次数:179
Mysql 变量讲解
set语句的学习:使用select定义用户变量的实践将如下语句改成select的形式:set @VAR=(select sum(amount) from penalties);我的修改:select @VAR:=(select sum(amount) from penalties);我这样改,虽然是...
分类:数据库   时间:2016-01-09 16:37:01    阅读次数:150
Coin Change
322. Coin ChangeTotal Accepted:4182Total Submissions:16210Difficulty:MediumYou are given coins of different denominations and a total amount of moneya...
分类:其他好文   时间:2016-01-05 20:29:42    阅读次数:125
leetcode@ [134] Gas station (Dynamic Programming)
https://leetcode.com/problems/gas-station/There are N gas stations along a circular route, where the amount of gas at station i is gas[i].You have a c...
分类:其他好文   时间:2016-01-05 18:42:14    阅读次数:161
leetcode@ [322] Coin Change (Dynamic Programming)
https://leetcode.com/problems/coin-change/You are given coins of different denominations and a total amount of money amount. Write a function to compu...
分类:其他好文   时间:2016-01-04 16:56:33    阅读次数:257
Coin Change
You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you nee...
分类:其他好文   时间:2016-01-04 14:29:53    阅读次数:154
MongoDB的数据类型
最近在写一个lua的MongoDB模块。MongoDB版本3.2,lua则是5.3.1。底层以C++来写,再把函数暴露给lua调用。但是在lua中打印结果时,发现了些奇怪的现象。首先,数据库中的内容:> db.item.find(){ "_id" : 2001, "amount" : 999 }.....
分类:数据库   时间:2016-01-03 20:56:18    阅读次数:171
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