mysql duplicate records

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

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,

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

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 *

We often encounter the need to delete repeated records in a data table. Below I will summarize several methods that can delete Repeated Records and help to improve efficiency. For more information, see. We often encounter the need to delete repeated

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 methods for deleting duplicate records in MySQL Databases [recommended] Summary of methods for deleting duplicate records in MySQL Databases [recommended] Table Structure: Mysql> desc demo; + ------- + ------------------ + ------ + -----

Table structure: Mysql> DESC Demo; +-------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+------------------+------+-----+---------+----------------+ | ID | int (one) unsigned |

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 deletes redundant duplicate records. Sometimes, multiple duplicate records exist in the database. In this case, deduplication is required, that is, only one record is retained... This is especially common in Data Warehouses because of human or