MySQL删除数据库中重复的数据，并保留一条

1.先创建数据库

#创建数据库
CREATE DATABASE student;

2.创建表

#创建表test1，字段为id,name,主键id自增
CREATE TABLE IF NOT EXISTS test1(
	id INT UNSIGNED AUTO_INCREMENT,
	NAME VARCHAR(100) NOT NULL,
	PRIMARY KEY(id)
)ENGINE=INNODB DEFAULT CHARSET=utf8;

3.添加数据

表中只有张三和李四是重复的，现在要删除表中重复的数据，但是要保留一条

4.写SQL语句执行（亲测有效）

DELETE FROM test1 WHERE NAME IN (SELECT * FROM (SELECT NAME FROM test1 GROUP BY NAME HAVING COUNT(NAME) > 1) t1) AND id NOT IN (SELECT * FROM (SELECT MIN(id) FROM test1 GROUP BY NAME HAVING COUNT(NAME) > 1) t2)