--生成码表if exists (select * from dbo.sysobjects where id = object_id(N'[codetable]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) drop table [codetable] ...
分类:
数据库 时间:
2014-07-16 23:07:18
阅读次数:
11086
Given a 2D board and a word, find if the word exists in the grid.The word can be constructed from letters of sequentially adjacent cell, where "adjace...
分类:
其他好文 时间:
2014-07-07 17:30:29
阅读次数:
160
Given a 2D board and a word, find if the word exists in the grid.
分类:
其他好文 时间:
2014-07-07 13:15:02
阅读次数:
165
原文:sql server 判断是否存在数据库,表,列,视图1 判断数据库是否存在if exists (select * from sys.databases where name = '数据库名')drop database [数据库名]2 判断表是否存在if exists (select * f...
分类:
数据库 时间:
2014-07-02 14:43:14
阅读次数:
247
--向表“j0261”插入数据时,检查学号是否存在于表“j026”中,如存在则进行插入操作,否则就不插入。
create trigger checkid on j0261
instead of insert
as
if(not exists(slect * from j026 where 学号=(select 学号 from inserted)))--如果插入j0261的那一条数据里的'学号'不存...
分类:
数据库 时间:
2014-07-02 09:39:12
阅读次数:
268
今天一个开发问到一个not exists问题,小小做个实验
实验1
SQL> select * from emp e1 where not exists (select 1 from emp e2 where e1.mgr = e2.empno);
EMPNO ENAME JOB MGR HIREDATE ...
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其他好文 时间:
2014-07-01 06:59:39
阅读次数:
164
数据表如下:CREATE TABLE IF NOT EXISTS `china` (`region_id` smallint(5) unsigned NOT NULL, `parent_id` smallint(5) unsigned NOT NULL DEFAULT '0', `region_na...
分类:
Web程序 时间:
2014-07-01 00:50:55
阅读次数:
255
Given a stringS, find the longest palindromic substring inS. You may assume that the maximum length ofSis 1000, and there exists one unique longest pa...
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其他好文 时间:
2014-06-30 22:43:45
阅读次数:
294
【题目】
Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set.
get(key) - Get the value (will always be positive) of the key if the key exists in the cache, otherwise return -1.
se...
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其他好文 时间:
2014-06-29 22:45:26
阅读次数:
358
Given a stringS, find the longest palindromic substring inS. You may assume that the maximum length ofSis 1000, and there exists one unique longest pa...
分类:
其他好文 时间:
2014-06-29 20:28:58
阅读次数:
183