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sql server 中存储过程where条件需要判断进行拼接
1 USE [Mct] 2 GO 3 /****** Object: StoredProcedure [dbo].[P_CountIcCardTradInfo] Script Date: 05/20/2015 09:04:45 ******/ 4 SET ANSI_NULLS ON 5 G...
分类:数据库   时间:2015-05-20 13:09:28    阅读次数:252
MYsql优化where子句
该部分讨论where子句的优化,不仅select之中,相同的优化同样试用与delete 和update语句中的where子句; 1: 移去不必要的括号: ((a AND b) AND c OR (((a AND b) AND (c AND d))))-> (a AND b AND c) OR ...
分类:数据库   时间:2015-05-20 12:53:03    阅读次数:192
Migration data on SQL
从表里面导出数据XML:-- exportdeclare @xml xml set @xml = (select * from (select TableName = 'Schema', xmlData = ( select * from [Schema] where id = 337...
分类:数据库   时间:2015-05-20 12:37:54    阅读次数:147
Sequence
SQL> select * from v$version where rownum=1; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Prod...
分类:其他好文   时间:2015-05-20 09:51:24    阅读次数:179
Count of Smaller Number
Give you an integer array (index from 0 to n-1, where n is the size of this array, value from 0 to 10000) and an query list. For each query, give you ...
分类:其他好文   时间:2015-05-20 07:09:41    阅读次数:97
Leetcode#113Path Sum II
PathSumIITotalAccepted:43473TotalSubmissions:162906MySubmissionsQuestionSolutionGivenabinarytreeandasum,findallroot-to-leafpathswhereeachpath‘ssumequalsthegivensum.Forexample:Giventhebelowbinarytreeandsum=22,5 /48 //11134 /\/7251return[ [5,4,11,2], [5..
分类:其他好文   时间:2015-05-20 02:11:01    阅读次数:111
Java for LeetCode 089 Gray Code
The gray code is a binary numeral system where two successive values differ in only one bit.Given a non-negative integer n representing the total numb...
分类:编程语言   时间:2015-05-20 01:56:53    阅读次数:188
WCF ChannelFactory
public static class WcfExtensions{ public static void Call(this T client, Action work) where T : ICommunicationObject { try { work(client); client.Clo...
分类:其他好文   时间:2015-05-19 22:31:52    阅读次数:203
MySQL Index Condition Pushdown(ICP)优化
Index Condition Pushdown(ICP)索引条件下推优化适用于mysql在table中通过index检索数据行,没有ICP,存储引擎层遍历索引来定位基表(base table)上的数据行并且把它们返回给server层,由server层来计算过滤where语句.使用ICP,并且...
分类:数据库   时间:2015-05-19 20:31:58    阅读次数:235
Oracle高级查询之OVER (PARTITION BY ..)
为了方便大家学习和测试,所有的例子都是在Oracle自带用户Scott下建立的。注:标题中的红色orderby是说明在使用该方法的时候必须要带上orderby。一、rank()/dense_rank()over(partitionby...orderby...)现在客户有这样一个需求,查询每个部门工资最高的雇员的信息,相信有一定o..
分类:数据库   时间:2015-05-19 19:18:31    阅读次数:194
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