select length(f3) - length(replace(f3, 'a','')) from t1简单的，如果，要统计 good 出现的次数，改成select (length(f3) - length(replace(f3, 'good ',''))) / length('good')....
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数据库 时间：
2014-11-25 12:11:37
阅读次数：
233
F -StoneTime Limit:1000MSMemory Limit:32768KB64bit IO Format:%I64d & %I64uSubmitStatusPracticeHDU 4764DescriptionTang and Jiang are good friends. To d...
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其他好文 时间：
2014-11-25 00:16:19
阅读次数：
147
Predict a biological response of molecules from their chemical properties
从分子的化学属性中预测其生物反应。
The objective of the competition is to help us build as good a model as possible so that we can, as op...
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其他好文 时间：
2014-11-24 19:19:09
阅读次数：
356
http://blog.csdn.net/chengyb74/article/details/4762247对于敏捷开发来说，User Story是开发的基础，它不同于传统的瀑布式开发方式，而是把原本需求拆成最小粒度的Story，以方便拆分Task，估计开发时间，领取开发任务。优点和好处Being ...
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其他好文 时间：
2014-11-24 16:58:59
阅读次数：
197
/// /// Perform a Clone of the object asdfas. /// /// The type of object being cloned. /// The object instance to clone. /// The ...
Screeching tires. Searching lights. Wailing sirens. Police cars everywhere. Trisha Quickfinger did it again! Stealing the `Mona Lisa' had been more difficult than planned, but being the world's best a...
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其他好文 时间：
2014-11-23 00:45:42
阅读次数：
151
Decode WaysA message containing letters from A-Z is being encoded to numbers using the following mapping:'A' -> 1'B' -> 2...'Z' -> 26Given an encoded ...
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其他好文 时间：
2014-11-22 18:53:35
阅读次数：
308
Not so Mobile
Before being an ubiquous communications gadget, a
mobile was just a structure made of strings and wires suspending colourfull things. This kind of mobile is usually found h...
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其他好文 时间：
2014-11-21 23:21:20
阅读次数：
213
之前还是处理好评论的差评和好评的分析，之后进行如下操作：Linux版本：cd Downloads/yihaodiancd trunk 进入trunk目录就可以进行训练了训练的命令： sh train.sh ../seg_good.data good.data 你的模型文件的名字训练完事，就可以进行测...
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系统相关 时间：
2014-11-21 14:20:14
阅读次数：
265
Being a Good Boy in Spring Festival
Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 4894 Accepted Submission(s): 2930
Problem Descr...
分类：
编程语言 时间：
2014-11-20 22:00:32
阅读次数：
192
