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SQL SERVER 查看SQL语句IO,时间,索引消耗
1.查看SQL语句IO消耗set statistics io on select * from dbo.jx_order where order_time>'2011-04-12 12:49:57.580'set statistics io off2.查看SQL语句时间消耗set statisti....
分类:数据库   时间:2014-07-09 21:49:17    阅读次数:314
Oracle的trunc和dbms_random.value随机取n条数据
今天在review项目代码的时候看到这样一个问题,有一张号码表,每次需要从这样表中随机取6个空闲的号码,也就是每次取出来的6个号码应该都会有所不同。然后我就看到了这样的SQL select t.* from tel_number_tbl t where t.status = '空闲' and t.a...
分类:数据库   时间:2014-07-09 00:30:21    阅读次数:220
Leetcode Valid Sudoku
Determine if a Sudoku is valid, according to:Sudoku Puzzles - The Rules.The Sudoku board could be partially filled, where empty cells are filled with ...
分类:其他好文   时间:2014-07-08 23:12:45    阅读次数:298
oracle下session的查询与删除
oracle下session的查询与删除 1、查询当前session SQL> select username,sid,serial# from v$session where username is not null; USERNAME                              SID    SERIAL# --------------------------...
分类:数据库   时间:2014-07-08 18:06:02    阅读次数:291
LeetCode——Container With Most Water
Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (i, 0). Fin...
分类:其他好文   时间:2014-07-08 14:21:56    阅读次数:190
【leetcode刷提笔记】Container With Most Water
Givennnon-negative integersa1,a2, ...,an, where each represents a point at coordinate (i,ai).nvertical lines are drawn such that the two endpoints of ...
分类:其他好文   时间:2014-07-06 17:44:30    阅读次数:181
数据库所有表替换所有列的特定字符串
DECLARE @TableName VARCHAR(119)DECLARE @TableID INTDECLARE @ColName VARCHAR(111)DECLARE Table_Cursor CURSOR FOR SELECT [name],id FROM sysobjects WHERE...
分类:数据库   时间:2014-07-06 15:11:47    阅读次数:280
ORA-01722: invalid number
---问题select owner,index_name,DEGREE from DBA_INDEXES where DEGREE>1 *ERROR at line 1:ORA-01722: invalid number--1 获取运行跟踪信息SQ...
分类:其他好文   时间:2014-07-06 13:41:04    阅读次数:278
Leetcode Word Search
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:2014-07-05 21:30:45    阅读次数:175
where VS having
where 和 having 的区别: WHERE 子句不能包含聚集函数; 因为试图用聚集函数判断那些行输入给聚集运算是没有意义的。相反,HAVING 子句总是包含聚集函数 having一般跟在group by之后,执行记录组选择的一部分来工作的。 where则是执行所有数据来工作的。再者havi....
分类:其他好文   时间:2014-07-05 20:57:59    阅读次数:239
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