sql duplicate database

Share the following method of deleting duplicate records in a database with an SQL statement.For example, there is now a person table (table name: peosons)If you want to name, ID, address, the three fields exactly the same record querySelect p1.*

Find duplicate data T-SQL in the database ========== first article ============ there are duplicate records under a field in a table, there are many ways, however, there is a method that is relatively efficient. The following statement: Select

Original post address: http://www.cnblogs.com/phpliu/archive/2010/06/21/1761726.html For example:ID name value1 A PP2 A PP3 B III4 B PP5 B PP6 c pp7 c pp8 C IIIID is the primary keyThis result is required.ID name value1 A PP3 B III4 B PP6 c pp8 C

This is often the case when developing databases:When a piece of data does not exist, insert the data. If the primary key of the data already exists in the database, update the data.How do you do this? First, query data based on the primary key, and

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

Original article: http://support.microsoft.com/kb/139444/SummaryThe Microsoft SQL Server table should not contain duplicate rows and non-unique primary keys. For the sake of conciseness, we sometimes refer to the primary key as "key" or "Pk" in this

In the previous blog, we used the duplicate method to create a physical standbyblog. csdn. netaaron8219articledetails38434579. Today we are talking about some problems encountered when using the non-duplicate method to create a slave database in 11g.

SQL statement for data duplication between Oracle and MySQL It can be said that this data is repeated, no matter in development, data maintenance and experience interviews, you should encounter common problems! Here, I also paid special attention to

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:

Create a local Duplicate database. The path of the newly created file is different from that of the target database, and the initialization parameter DB_NAME of the auxiliary instance cannot be the same as that of the target database. 1. Create a