First, what do you mean by "regs"?
If I understand your question, you want to know if mysql will re-use an old
auto_increment value that has been deleted. The answer is yes and no.
If you say: DELETE FROM mytable;
then the next insertion will cause the auto_increment value to begin at 1
If you
Yes you sure can,..
When you insert a row just use one of the older values that no longer exists
on the table.. Alternatively, you can insert a blank value, mysql will
automatically set it to the next value after the highest one in the table
and then you can update it to one of the older values.
