Data types: Explict Implict Difference between recommender and prediction: 推荐系统建议你可能感兴趣的东西(top n interested),而预测则预测用户对东西的喜好程度。 TOP-N + Softer/Organic Presentation ...
分类:
其他好文 时间:
2015-04-25 00:30:13
阅读次数:
178
VHDL Type Cast and Conversion FunctionsThe picture below illustrates how to convert between the most common VHDL types.
分类:
其他好文 时间:
2015-04-25 00:05:48
阅读次数:
176
select * from emp;--输出工资在[1500,3000]范围之内的工资最高的前5个员工信息select top 5 * from emp where sal between 1500 and 3000 order by sal desc;
分类:
数据库 时间:
2015-04-24 12:10:37
阅读次数:
166
select id,name,energy from db_name where engrgy between '100' and '201'
对输出的内容进行1次排序 需要使用order by asc为从小到大 从大到小为desc
select id,name,energy from db_name where engrgy between '100' and '201' order by...
分类:
数据库 时间:
2015-04-24 01:05:43
阅读次数:
221
--sal为员工工资select * from emp;--查询工资在[1500,3000]范围的员工信息select * from emp where sal >= 1500 and sal <= 3000;select * from emp where sal between 1500 and ...
分类:
数据库 时间:
2015-04-24 00:47:46
阅读次数:
365
运算符优先级顺序最高优先级 :=1 ||, or, xor2 &&, and3 between, case, when, then, else4 =, , >=, >, , !=, is, like, regexp, in5 |6 &7 >8 -, +9 *, /, div, %, mod10 ^1...
分类:
数据库 时间:
2015-04-23 17:07:05
阅读次数:
1613
deferred queryforeach() is where query is executeddata changes between executions,the result is different.ToList() ToArray()cache the dataList cache =...
分类:
其他好文 时间:
2015-04-22 22:00:25
阅读次数:
114
1、下面的 SELECT 语句列出了 AGE 的值在 25 与 27 之间的所有记录:SELECT * FROM COMPANY WHERE AGE BETWEEN 25 AND 27;下面的语句是错误的,WHERE前面不能有逗号UPDATE 't_sportList' SET sl_02_EndT...
分类:
数据库 时间:
2015-04-22 21:58:50
阅读次数:
156
今天在配applicationContext.xml的时候出现了这样一个错误:
x: White spaces are required between publicId and systemId
我用的是Spring3.0.5
错误在于下列标签的顺序必须按照下面的来
xsi:schemaLocation="http://www.springframework.org/schema/bea...
分类:
其他好文 时间:
2015-04-22 18:17:17
阅读次数:
129
win8 导入virtualbox介质发生错误, NtCreateFile(\Device\VBoxDrvStub) failed: Unkown Status - 5600 (0xffffea20) (rcNt=0xe986ea20) VBoxDrvStub error: ntdll.dll: 7982 differences between 0x300c and 0x...