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mysql exists 和 in的效率比较
这条语句适用于a表比b表大的情况select * from ecs_goods a where cat_id in(select cat_id from ecs_category);这条语句适用于b表比a表大的情况select * from ecs_goods a where EXISTS(sele...
分类:数据库   时间:2015-11-17 23:20:35    阅读次数:212
summit导入导出命令
Summit导出命令Summit_export –ENT EXTSYSTEM –SQL “where ExtSystem in (’……’,’……’)” –XML –O ……导出application:–ENT APP导出mapping: –ENT MAP_DEFSummit导入命令Trade_im...
分类:其他好文   时间:2015-11-17 20:42:32    阅读次数:274
excel导入记录
use DangJianSELECT vale1, value2 into Table2 from Table1select COUNT(*) from tmpdangyuan where 手机号 in (select phone from T_YEWU_User)select COUNT(1) f...
分类:其他好文   时间:2015-11-17 18:56:22    阅读次数:135
mysql 分页存储过程
CREATE PROCEDURE sp_GetInfo(in _where varchar(2000),in _orderby varcahr(200),in _pageindex int,in _pagesize int,out _totalcount)BEGIN SET @startrow =....
分类:数据库   时间:2015-11-17 16:37:40    阅读次数:129
Mysql
update a00 ,(select a,b as bb from a00) as T2 set a00.d =CONCAT("{themeCode:",'"',T2.bb,'"',"}") where a00.a =T2.a
分类:数据库   时间:2015-11-17 12:55:38    阅读次数:146
[Lintcode] Add Two Numbers I && II
Add Two NumbersYou have two numbers represented by a linked list, where each node contains a single digit. The digits are stored inreverseorder, such ...
分类:其他好文   时间:2015-11-17 12:52:20    阅读次数:180
DISTINCT删除重复数据
DISTINCT 语法1 SELECT DISTINCT NAME FROM TABLENAME删除去重SQL语法DELETE FROM QuestionLib where ID in ( select min(ID) ID FROM QuestionLib group by NAME having...
分类:其他好文   时间:2015-11-17 12:31:52    阅读次数:109
泛型函数
using System;using System.Collections.Generic;public class MyClass{ static void DoStuff(T t,S s) where T:MyClass { Console.WriteLine("T:{0}",t); Con.....
分类:其他好文   时间:2015-11-17 12:30:51    阅读次数:113
sql语句中where 1=1的作用
1=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: create table table_temp tablespace tbs_temp as select * from table_ori where 11 建成一个与table_ori 结构相同的表table_te...
分类:数据库   时间:2015-11-17 12:21:11    阅读次数:146
oracle字典---表和字段
获取表字段: select *? from user_tab_columns? where Table_Name=‘用户表‘? order by column_name 获取表注释: select *? from user_tab_comments? where Table_Name=‘用户表‘ order by Table_Name 获取字...
分类:数据库   时间:2015-11-17 11:12:09    阅读次数:195
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