Let's say I have a table with an auto_increment field called "id"..
This table got 5 rows.. where "id" goes from 1-5..
Now I delete row 4 and 5..
The next row I insert will get "id" = 6...
How do I get it do let the next "id" to start at 4 which is the highest available number?
(Don't ask why I need that

)