When using mysql, table usually have an auto-incremented id field, but when we want to re-add the data table to clear the data in the hope id restarts counting from 1, with the following two methods are available:
Usually set auto-increment field methods:
add when you create the table:
create table table1(id int auto_increment primary key,...)
After you create a table added:
alter table table1 add id int auto_increment primary key field increment, must be set as primary key.
example
alter table tablename drop column id;
alter table tablename add id mediumint(8) not null primary key auto_increment first;
Method Two:
alter table tablename auto_increment=0