delete duplicate records in sql

SQL statements remove duplicate records, get duplicate records --Query a table to effectively remove duplicate records, UserID as a self-growing primary key, Roleid as a repeating field

Label:Title, Preliminary discussion on Oracle delete duplicate records, keep only rowid minimum records (ROWID can reflect the order in which data is inserted into the database)There are several ways to delete duplicate

SQL deletes duplicate and SQL duplicate records in a table. I have encountered the problem of Repeated Records in the table. The fastest way to directly write SQL statements to

The SQL statement I used: Delete from fp_sgfpxxWhere fphm in (select fphm from fp_sgfpxx group by fphm having count (fphm)> 1)And rowid not in (select min (rowid) from fp_sgfpxx group by fphm having count (fphm)> 1) Delete duplicate invoice numbers SQL statement used to

Delete from bonus A where . rowid! = ( select max ( rowid ) from bonus B where . ename = B. ename and . job = B. job); use a pseudo column. 1,Oracle, Each record hasRowid,RowidIt is unique in the whole database,RowidIt is determined that each record is inOracleWhich data file, block, and row is in.2In duplicate records, all columns

oracle| Repeat | repeat record You might be working at work. When you try to create a unique index to a column or column in a library table, you are prompted to ORA-01452: You cannot create a unique index and find duplicate records. Here's a summary of several ways to find and delete duplicate

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

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

when the values of the C1, C10, and C20 columns are the same are repeated records.The following table shows a total of 16 records in the CZ table:SQL> set pagesize 100SQL> select * From CZ;C1 C10 C20-----------------------1 2 DSF1 2 DSF1 2 DSF1 2 DSF2 3 Che1 2 DSF1 2 DSF1 2 DSF1 2 DSF2 3 Che2 3 Che2 3 Che2 3 Che3 4 DFF3 4 DFF3 4 DFF4 5 err5 3 Dar6 1 wee7 2 zxc20 rows selected.1. Several Methods for searching dupl