how to eliminate duplicate records in sql

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Delete duplicate records in the Table. Only one row is retained.

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 query Repeated Records of multiple fields in

How to use rowID to find and delete duplicate records in a table in Oracle

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 records (for example, C

Quickly delete duplicate records

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

Several Methods for SQLServer to delete duplicate records

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

Summary of methods for deleting duplicate records in MySQL Databases

This article summarizes the various SQL statements used to delete duplicate records in the mysql database. The following describes the operation methods with examples. For more information, see. This article summarizes the various SQL statements used to delete duplicate

Summary of methods for deleting duplicate records in MySQL database

MySQL database, often encounter duplicate records, then need to delete duplicate records SQL, the following list of four ways to delete duplicate records, for different situations, I ho

Oracle queries and deletes duplicate records

SQL statement for querying and deleting duplicate records 1, look for redundant records in the table, duplicate records are based on a single field (Peopleid) to determineSELECT * from Peoplewhere Peopleid in (select Peopleid from

Three ways to remove duplicate records from Oracle queries

Tags: oid delete query drop person where copy Deb action methodThis article lists 3 ways to delete duplicate records, namely ROWID, group by and distinct, which can be consulted by small partners.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 queryThe code is as follows: Select p1.*From persons p1,persons P2where p1.id

How to find out the duplicate records of field values in the same table

How to find out the duplicate records of field values in the same table(2013-03-25 11:28:51)reproduced For example, there is now a table (table name: peosons) If you want to name, social Security number, address the three fields exactly the same record query outSelect p1.* from Persons p1,persons P2where p1.idp2.id and P1.cardid = P2.cardid and P1.pname = p2.pname and p1.address = p2.address can achieve th

Rowid to delete duplicate records !!!

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 zxc 20 rows selected. 1. Several Methods for searching duplicate records:(1).

How to Use rowid in Oracle to find and delete duplicate records in a table)

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

Oracle query deletes duplicate records three ways _oracle

For example, now there is a person table (table name: peosons)If you want to have the name, ID number, address of these three fields exactly the same records query Copy Code code as follows: Select p1.* From persons p1,persons P2 where p1.idand P1.cardid = P2.cardid and P1.pname = p2.pname and p1.address = p2.address can achieve this effect. Several SQL statements that delete

Delete duplicate records in sqlserver and save one of them according to the conditions

of the code is to delete the duplicate records in the Tbtradefullinfoget and save only the largest Intime record in the table! Some other delete duplicate records SQL statements 1, SQL Server lookup table redundant

Oracle quickly deletes duplicate records _oracle

The Oracle tutorial you are looking at is: Oracle quickly deletes duplicate records. When working on a project, when a colleague guides the data, he accidentally makes all the data in a table heavier, that is to say, there is a duplicate of all the records in this list. The data for this table is tens, and it is a prod

How to find and delete duplicate records in a table

Repeat how to find and delete duplicate records in a table Software Environment: 1, Windows nt4.0+oracle 8.0.4 2, the Oracle installation path is: C:\ORANT Issue: 1, when we want to create a unique index for a table, if the table has duplicate records, you cannot create a success. Method principle: 1, Oracle, each reco

Methods to determine duplicate records in an Oracle database table

. Group the columns that need to create a unique index and count the number of each group, obviously if there are more than 1 records in the group there are duplicate rows. Three, Exception into clause The exception into clause in the ALTER TABLE command can also be used to determine duplicate records in a library ta

Oracle FAST Delete mass data methods (delete all, condition Delete, delete large number of duplicate records) __oracle

Delete all If you are deleting all the data for a table and do not need to roll back, use TRUNCATE to OK. About Trancate See here http://blog.csdn.net/gnolhh168/archive/2011/05/24/6442561.aspx Sql> TRUNCATE TABLE table_name; Conditional Deletion If there is a condition for deleting the data, such as delete from tablename where col1 = ' Lucy '; At this time, in addition to Gazzo, you can delete the Add no logging option, do not write log speed up the

MySQL distinct statement to query duplicate records and related performance discussion _ MySQL

to understand, the selection rules of exists or in should be the same in the subquery: the selection depends on the validity of the date and commodity conditions. Unless the business in the past six months is very light, the product name should be the most effective filter condition, so in is better than exists in subqueries. this is because, it is faster than the reverse operation to first find orders for all the bat vehicles and then check whether the sales have occurred in the last six month

Three methods for querying duplicate records in Oracle

warehouse picking table. This method is a little more troublesome. To use the "upgrade eion into" clause, you must first create the conditions table. The SQL script file used to create the table is utlexcpt. SQL. For NT and UNIX systems, Oracle stores the file in a slightly different location. In the NT System, the script file is stored in the ORACLE_HOME \ Ora81 \ rdbms \ admin directory; for UNIX systems

Distinct MySQL filtering duplicate records

Tags: preserve multiline specified efficiency images issue title duplicate record returnGoDistinct this keyword to filter out redundant duplicate records only retains one, but it is often used only to return the number of distinct records, rather than using it to return all values that are not re-recorded. The reason i

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