duplicate annihilator

information can be completely recovered from the lossless compressed data from the original data information. 3 Data de-weightData de-weight ( Data deduplication) is the process of discovering and eliminating duplicate content in a dataset or data stream to improve the storage and / or transfer efficiency of data, also known as deduplication ( Duplicate data Elimination), simply weigh or re-delete. As a ke

Deleting duplicate records in a database has been a very annoying thing, I collected Oracle and SQL Server rapid deletion of duplicate records of the method for your reference, I hope to help you. SQL SERVERPresumably every SQL Server developer has had a similar experience, from time to time, when querying or counting a database, the query and statistical results are inaccurate due to

The unstable development of the Internet, users can not have more original content, resulting in most of the site content source collection, the Internet spam Information is a large number of dissemination. Stationmaster all know this kind of duplicate content does not have the benefit, even if the website has a period of time because these content brings the benefit, stationmaster also want to anticipate, reduce the content of

Target Library and Replication library environment:os:linux Red Hat as 4DB version:10.2.0.11. Target Library and replication library informationThe target database in Rman refers to the library being replicated, and the copy library (duplicate database) refers to the new library generated after replication. For testing convenience, the directory structure settings for the copy library and the target library are the same.Target Library:ip:192.168.30.37

Tags: style blog color using OS data for problemsOne, part of the same field to remove duplicate data method:By grouping group by repeating field the having (*) >1 condition--"Extract the duplicate field value--" Finally, based on the uniqueness of the ID--Get the value of min or Max ID in the duplicated data--"and then query the original table for duplicate data

Turn from Hibiscus bloghttp://blog.sina.com.cn/liurongxiu1211 SQL to remove duplicate statements(2012-06-15 15:00:01)SQL single table/multi-table query removes duplicate recordsSingle table DistinctMulti-table GROUP byGroup by must be placed before order by and limit, or it will be an error************************************************************************************1, look for redundant records in th

For example, if the primary key is required to obtain such results as idnamevalue1app3biii4bpp6cpp8ciii method 1 deleteYourTablewhere [id] notin (selectmax ([id]) fromYourTablegroup For example: id name value 1 a pp 2 a pp 3 B iii 4 B pp 5 B pp 6 c pp 7 c pp 8 c iii id is the primary key requirement to get this result id name value 1 pp 3 B iii 4 B pp 6 c pp 8 c iii method 1 delete YourTable where [id] not in (select max ([id]) from YourTable group For example: Id name value 1 a pp 2 a pp 3

Insert Syntax INSERT [Low_priority | Delayed | High_priority] [IGNORE] [Into] tbl_name [(Col_name,...)] VALUES ({expr | DEFAULT},...), (...),... [on DUPLICATE KEY UPDATE col_name=expr, ...] Or: INSERT [Low_priority | Delayed | High_priority] [IGNORE] [Into] Tbl_name SET col_name={expr | DEFAULT}, ... [on DUPLICATE KEY UPDATE col_name=expr, ...] Or: INSERT [Low_priority | High_priority] [IGNORE] [Into] tbl_

SQL statement Query method for database duplicate records SQL statement query database duplicate record method SQL statement query database record SQL statement query database duplicate record Suppose you have an existing list of people (table name: person), and if you want to find out the exact same records in the three fields of the name, ID number and address,

We may encounter this situation in the operation of the database, the data in the table may be repeated, so that we have a lot of inconvenience in the operation of the database, then how to delete these duplicate useless data? The data de-duplication technology can provide more backup capacity, achieve longer data retention, maintain continuous verification of backup data, improve the level of data recovery service, and facilitate data disaster tolera

oracle| Design | data | Repeat we may have this situation, a table originally poorly designed, resulting in the table data data duplication, then, how to delete the duplicate data? Duplicate data may have two scenarios, the first one being only some of the fields in the table, and the second is exactly the same as two rows of records. One, for partial field duplicate