码迷,mamicode.com
首页 >  
搜索关键字:where    ( 20257个结果
hdu 2795 Billboard
hdu 2795 的传送门–>Problem Description At the entrance to the university, there is a huge rectangular billboard of size h*w (h is its height and w is its width). The board is the place where all possible...
分类:其他好文   时间:2015-08-08 13:38:45    阅读次数:141
Billboard
Problem Description At the entrance to the university, there is a huge rectangular billboard of size h*w (h is its height and w is its width). The board is the place where all possible announcements ...
分类:其他好文   时间:2015-08-08 12:05:48    阅读次数:102
msyql中子查询IN,EXISTS,ANY,ALL,SOME,UNION介绍
1.ANY关键字假设any内部的查询语句返回的结果个数是三个,如:result1,result2,result3,那么,select ...from ... where a > any(...);->select ...from ... where a > result1 ora > result2...
分类:其他好文   时间:2015-08-08 01:18:22    阅读次数:154
sql函数
avg() ????select ?avg(orderPrice) ?As OrderAverage ?from ?orders ????select ?customer ?from orders ?where ?orderPrice>(select ?avg(OrderPrice) ?from ?Orders) count() ????sel...
分类:数据库   时间:2015-08-07 22:28:59    阅读次数:141
[leetcode 238]Product of Array Except Self
Given an array of n integers where n > 1, nums, return an array output such that output[i] is equal to the product of all the elements of nums except nums[i]. Solve it without division and in O...
分类:其他好文   时间:2015-08-07 19:56:16    阅读次数:112
where 1=1
sql:where 1=11=1 永真, 11 永假。11 的用处:用于只取结构不取数据的场合例如:拷贝表create table_name as select * from Source_table where 1=1;复制表结构create table_name as select * from...
分类:其他好文   时间:2015-08-07 19:17:15    阅读次数:137
导出共享邮箱的成员
Get-Mailbox | where RecipientTypeDetails -EQ "sharedmailbox" | Get-MailboxPermission | where user -Like *vob* | select identity, user | export-csv -P....
分类:其他好文   时间:2015-08-07 19:17:00    阅读次数:174
通过开户银行账号查询客商名称 sql
select * from bd_cubasdoc where pk_cubasdoc in (select pk_cubasdoc from bd_custbank where account='37101986106051026069')
分类:数据库   时间:2015-08-07 18:53:35    阅读次数:203
数据库SQL优化大总结
1.对查询进行优化,要尽量避免全表扫描,首先应考虑在 where 及 order by 涉及的列上建立索引。2.应尽量避免在 where 子句中对字段进行 null 值判断,否则将导致引擎放弃使用索引而进行全表扫描,如:select id from t where num is null最好不要给数...
分类:数据库   时间:2015-08-07 18:35:28    阅读次数:158
ORACLE的表被 另一个用户锁定,如何解除..
SELECT object_name, machine, s.sid, s.serial# FROM gv$locked_object l, dba_objects o, gv$session s WHERE l.object_id = o.object_id AND l.session_id = ...
分类:数据库   时间:2015-08-07 17:54:03    阅读次数:233
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!