how to find duplicate records in mysql

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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 hope to help you. 1, look for redundant records in the table,

How to query and delete duplicate records in MySQL

ObjectiveThis article mainly introduces to you about MySQL query, delete duplicate record of method, share out for everyone reference study, below to see detailed introduction:Find records for all repeating headings:? 1

How to query and delete duplicate records in MySQL

If you like these articles, click here to subscribe to this BlogMySQL Method for querying and deleting duplicate records (1) 1. Find excess duplicate records in the Table. duplicate records are based on a single field (peopleId) select *

Find duplicate T-SQL in Database

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

MySQL Query deletes duplicate records

Ways to query and delete duplicate records1, look for redundant records in the table, duplicate records are based on a single field (Peopleid) to determineSELECT * from people where Peopleid in (select Peopleid from People GROUP by Peopleid have

Summary of SQL statements for deleting duplicate data records in mysql

There are many ways to delete duplicate records. Here I summarize a variety of SQL statements for deleting restart records, such as deleting duplicate id data and searching for duplicate records, remove the smallest record, delete the repeat record,

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

This article mainly introduces the distinct statement in MySQL to query duplicate records and related performance discussions. the point in this article is to avoid using distinct in top-level queries under certain circumstances, for more

Duplicate records in MySQL query table

A1, look for redundant records in the table, duplicate records are based on a single field (Peopleid) to determine the select * from Peoplewhere peopleid in (select Peopleid from people GROUP by Peopleid Having count (Peopleid) > 1) 2, delete

Duplicate records in MySQL query table

Ways to query and delete duplicate recordsA1, 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 People GROUP by Peopleid have

Duplicate records in MySQL query table

1, look for redundant records in the table, duplicate records are based on a single field (Peopleid) to determine the select * from Peoplewhere peopleid in (select Peopleid from people GROUP by Peopleid Having count (Peopleid) > 1)  2, delete

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