Recreate a auto increment column in mysql

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If you have a MySQL table which uses a auto increment column, you might have noticed that sometimes this column can skip a few numbers, especially if you delete from the table.


Since this can cause problems with queries, here is how to recreate a auto increment column in MySQL:

For this example lets assume that your table is called websites and the auto increment column is called id.

So, first drop the column from the table:

alter table websites drop id;


Then, initialize the auto_increment:

alter table websites auto_increment=1;


Last, all you have to do is recreate the auto increment column:

alter table websites add id int not null auto_increment primary key first;


In this example, id is your primary key. If it isn´t in your table, just leave it out.



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