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...
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其他好文 时间:
2015-08-08 13:38:45
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141
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 ...
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其他好文 时间:
2015-08-08 12:05:48
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102
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...
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其他好文 时间:
2015-08-08 01:18:22
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154
avg() ????select ?avg(orderPrice) ?As OrderAverage ?from ?orders ????select ?customer ?from orders ?where ?orderPrice>(select ?avg(OrderPrice) ?from ?Orders) count() ????sel...
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数据库 时间:
2015-08-07 22:28:59
阅读次数:
141
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...
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其他好文 时间:
2015-08-07 19:56:16
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112
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...
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其他好文 时间:
2015-08-07 19:17:15
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137
Get-Mailbox | where RecipientTypeDetails -EQ "sharedmailbox" | Get-MailboxPermission | where user -Like *vob* | select identity, user | export-csv -P....
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其他好文 时间:
2015-08-07 19:17:00
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174
select * from bd_cubasdoc where pk_cubasdoc in (select pk_cubasdoc from bd_custbank where account='37101986106051026069')
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数据库 时间:
2015-08-07 18:53:35
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203
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...
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数据库 时间:
2015-08-07 18:35:28
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158
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 = ...
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数据库 时间:
2015-08-07 17:54:03
阅读次数:
233