1.查看回收站中的表: select object_name,original_name,partition_name,type,ts_name,createtime,droptime from recyclebin; 2.恢复表: flashback table (表名) to before drop 或flashback table (回收站中的表名) to before drop;
GO USE [JC2010_MAIN_DB] 1.新建备份表JobObjectVersion_JCSchemVersion_BCK) GO IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[JobObjectVersion_JCSchemVersion_BCK]') AND type in (N'U')) DROP TABLE [dbo].[JobObjectVersion_JCSchemVers
My name is Farooq and I am with HDinsight support team here at Microsoft. In this blog I will try to give some brief overview of Sqoop in HDinsight and then use an example of importing data from a Windows Azure SQL Database table to HDInsight cluster
SELECT (case when a.colorder=1 then d.name else '' end)表名, a.colorder 字段序号, a.name 字段名, (case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end) 标识, (case when (SELECT count(*) FROM sysobjects WHERE (name in (SELECT name FROM sysin
表tariff_info, 原始数据: 想要的结果:以start_time时间倒序排序, 以code分类, 查询每一类最新的一条记录 sql: SELECT a.* FROM TARIFF_INFO a, ( SELECT code, MAX (start_time) start_time FROM TARIFF_INFO GROUP BY code ) b WHERE a.start_time = b.start_time AND a.code = b.code ORDER BY a.code
前言:我们知道SQLSERVER清空数据表有两种方式Delete和Truncate,当然两者的不同大家也都知道(不清楚的可以MSDN).不过这个错误“Cannot truncate table because it is being referenced by a FOREIGN KEY” 相信大家也都遇到过,解决的已解决,未解决的且看下文. 如何解决 开始我以为只要将外键Disable掉就可以了,事实证明是没用的.其实MSDN已经明确告诉了我们: 不能对以下表使用 TRUNCATE TABL
最近在操作表中数据时,删除了表中数据,但是又想恢复,后来查到了官方的一篇文档,发现还蛮有用的,如下: 在pl/sql中运行,select * from A as of TIMESTAMP to_timestamp('','yyyymmdd'); 此原理是利用Flashback Query这一特性,最常被应用的就是修复误操作的数据了.注意,这并不是说Flashback Query能够恢复数据.Flashback Query本身不会恢复任何操作或修改,也不能告诉你做过什么操作或修改,实际上Flash