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In MySQL basics, MySQL adds an automatically added primary key (or any field) to an existing table

2022-06-10 20:37:00 【Rulyc】

1、 grammar ：

alter table student_info add id int(11) PRIMARY KEY AUTO_INCREMENT;

If you want to add any fields ,

alter  Table name  student_info add  Field name   Field type

Before you add ：
Insert picture description here
After adding ：

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