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QlikView处理数据
BI工具QLIKVIEW做ETL的常用方法: 1, 如何在QVD文件里加载特定的数据,即带上过滤条件的数据信息 ORGANZIATON: LOAD ORG_ID,      LOB,      ORG_NAME FROM $(sPath)\ORGANIZATION.qvd(qvd) Where LOB='BDS';   2, 如何在QV里加载一组内部特定的数据信息...
分类:其他好文   时间:2015-02-28 21:38:17    阅读次数:160
查看sqlserver被锁的表以及如何解锁
查看sqlserver被锁的表:select request_session_id spid,OBJECT_NAME(resource_associated_entity_id) tableName from sys.dm_tran_locks where resource_type='OBJE.....
分类:数据库   时间:2015-02-28 18:01:02    阅读次数:162
mysql 优化
1.应尽量避免在 where 子句中使用!=或操作符,否则将引擎放弃使用索引而进行全表扫描。2.对查询进行优化,应尽量避免全表扫描,首先应考虑在 where 及 order by 涉及的列上建立索引。 3.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...
分类:数据库   时间:2015-02-28 16:18:31    阅读次数:189
Path Sum II
https://oj.leetcode.com/problems/path-sum-ii/Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum.For...
分类:其他好文   时间:2015-02-28 16:14:26    阅读次数:155
sql 基础--mysql 5 (10)
17.更新和删除数据更新: update table set columns = ‘value’ where ...mysql> update pw_price set price=10000 where uid=6;Query OK, 1 row affected (0.03 sec)Rows m...
分类:数据库   时间:2015-02-28 15:55:55    阅读次数:193
sql 基础--mysql 5 (8)
15.组合查询 unionmysql> select uid,first_name,price from pw_price where uid >2 union select uid,first_name,price from pw_price where price>=1000;+-----+--...
分类:数据库   时间:2015-02-28 11:22:30    阅读次数:173
SQL2008知识回顾
SQL2008 一、安装注意事项:1.修改用户权限(在一个安装页面中有七八个)(改成net.) 2.添加当前系统用户为账户二、主键,约束,索引三、增删改查; insert、delete、updateselect__*或者列名_____from 表where_______排序分组 逐条核对...
分类:数据库   时间:2015-02-27 22:46:49    阅读次数:143
NSOperations and NSOperationQueues学习笔记
一、GCD VS NSOperation and NSOperationQueue Here’s a quick comparison of the two that will help you decide when and where to use GCD or NSOperation and NSOperationQueue: GCD is a lightweight way to repres...
分类:其他好文   时间:2015-02-27 20:17:41    阅读次数:273
LeetCode134——Gas Station
There are N gas stations along a circular route, where the amount of gas at station i is gas[i]. You have a car with an unlimited gas tank and it costs cost[i] of gas to travel from station i to it...
分类:其他好文   时间:2015-02-27 17:07:10    阅读次数:147
ocp 1Z0-042 1-60题解析
1. Because of a power outage,instance failure has occurred. From what point in the redo log does recovery begin and where does it end?A. Current redo ...
分类:其他好文   时间:2015-02-27 16:50:49    阅读次数:290
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