一、多个条件查询:in、between select * from category where parent='013' or parent='12' or parent='011'等于select * from category where parent in ('011',''012','01...
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其他好文 时间:
2014-11-24 15:11:17
阅读次数:
185
puts("Please input a number between 1 and 100: "); scanf("%d",&Number); printf("Your input number is %d\n",Number); ...
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其他好文 时间:
2014-11-23 18:50:55
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147
ProblemWe are given a specific time(like 02:23), we need to get the angle between hour and minute(less than 180)Solution 1 public static double clockA...
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其他好文 时间:
2014-11-21 10:36:27
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211
1:在程序运行中进行宏定义CALL routines that enable you to transfer information between an executing DATA step and the macro processor.You can use the SYMPUT routi...
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数据库 时间:
2014-11-20 13:37:57
阅读次数:
405
题目描述:
The Head Elder of the tropical island of Lagrishan has a problem. A burst of foreign aid money was spent on extra roads between villages some years ago. But the jungle overtake...
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其他好文 时间:
2014-11-20 09:08:21
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364
1、常用的查询条件:
(1)比较 =,>,=,(不等于),!>(不大于),!
(2)确定范围 between and , not between and
(3)确定集合 in , not in
(4)字符匹配 like , not like
(5)空值 is null , is not null
(6)多重条件(逻辑运算)and , or , not
2、聚集函数
count([d...
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数据库 时间:
2014-11-19 22:17:48
阅读次数:
159
(1). There is a natural isomorphism between the spaces $\scrH\otimes \scrH^*$ and $\scrL(\scrH,\scrK)$ in which the elementary tensor $k\otimes h^*$co...
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其他好文 时间:
2014-11-19 18:05:06
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326
void func(){ static int static_var=1; int non_static_var=1; static_var++; non_static_var++; cout<<"Static="<<static_var; cout<<"NonS...
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编程语言 时间:
2014-11-18 15:55:47
阅读次数:
130
1、在大部分情况下,where条件语句中包含or、not,SQL将不使用索引;可以用in代替or,用比较运算符!=代替not。2、在没有必要显示不重复运行时,不使用distinct关键字,避免增加处理时间。3、当使用and运算符查找某个范围内的数据时,一般不使用索引,可以用between代替。总之,...
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数据库 时间:
2014-11-18 13:22:04
阅读次数:
158
题目描述
Problem C: Celebrity Split
Jack and Jill have decided to separate and divide their property equally. Each of their N mansions has a value between 1,000,000
and 40,000,000 dollars. J...
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其他好文 时间:
2014-11-17 21:17:46
阅读次数:
239