Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephon...
分类:
其他好文 时间:
2014-09-16 00:05:09
阅读次数:
405
'[^\.0-9]'——不含小数点和数字的字符串,^在中括号内表非select '123' aa from dual where regexp_like( '123', '[^\.0-9]' ) --没有记录,不存在子集(无论是一参对二参,还是二参对一参)select '123' aa from d...
分类:
其他好文 时间:
2014-09-15 21:15:49
阅读次数:
163
Step 0: Load dataThe starter code contains code to load 45 2D data points. When plotted using the scatter function, the results should look like the f...
分类:
其他好文 时间:
2014-09-14 21:54:27
阅读次数:
314
正确char *s;s=“MJ”;错误:char s[10];s="MJ”;因为s是个常量,代表数组的首地址,不能进行赋值运算。1、char *s=“MJ”;3、*s="like”;第3行代码相当于把字符串"like"存进s指向的那一块内存空间,由第1行代码可以看出,s指向的是"mj"的首字符'm'...
分类:
其他好文 时间:
2014-09-14 20:31:27
阅读次数:
212
--检查已标记为需要删除的临时表select * from T_BAS_TEMPORARYTABLENAME;--所有系统创建的临时表及视图SELECT * FROM sys.tables WHERE name LIKE 'TMP%' -- 查看系统所有表占用的空间情况create table tm...
分类:
数据库 时间:
2014-09-14 08:56:46
阅读次数:
362
Problem Description
I used to think I could be anything, but now I know that I couldn't do anything. So I started traveling.
The nation looks like a connected bidirectional graph, and I am rando...
分类:
其他好文 时间:
2014-09-14 01:27:16
阅读次数:
274
The string "PAYPALISHIRING" is
written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)
P A H N
A P L S I ...
分类:
其他好文 时间:
2014-09-13 22:52:36
阅读次数:
209
Problem Description
I used to think I could be anything, but now I know that I couldn't do anything. So I started traveling.
The nation looks like a connected bidirectional graph, and I am randoml...
分类:
其他好文 时间:
2014-09-13 22:50:06
阅读次数:
202
①在sql中不等于使用的是
eg:select * from emp where deptno
①模糊匹配 关键字是like _代表一个字符,%代表0个或多个.
eg: select ename from emp where ename like '_A%';
②sql中的转义字符用 escape 关键字后面跟上'使用的字符'(经实验''中字符可以为任意字符,数字和字母也可以,但必须...
分类:
数据库 时间:
2014-09-13 18:47:25
阅读次数:
242
Suppose you have to evaluate an expression like A*B*C*D*E where A,B,C,D and E are matrices.Since matrix multiplication is associative, the order in which multiplications are performed isarbitrary. How...
分类:
其他好文 时间:
2014-09-13 09:26:28
阅读次数:
210