Database tips: delete duplicate records in MySql

Table Structure:
Create table tab_name
(
Id tinyint,
Name varchar (10 ),
Age tinyint,
Phone varchar (15 ));

Original content: select * from tab_name;
Id name age phone
1 zhangsan 10 12345678910
2 lisi 28 98765432110
3 wangwu 33 45678912312
4 zhaoliu 45 78945612354
2 lisi 28 98765432110
3 wangwu 33 45678912312

Search after deduplication: select * from tab_name group by id, name, age, phone;
Id name age phone
1 zhangsan 10 12345678910
2 lisi 28 98765432110
3 wangwu 33 45678912312
4 zhaoliu 45 78945612354

Create another table to save and delete duplicate content: create table temp select * from tab_name group by id, name, age, phone;

Delete original table content: delete from tab_name;

Correct Import Record: insert into tab_name select * from temp;

If you only want to delete some records, you can use the where clause: select * from tab_name where id = 1 group by id, name, age, phone;