how to reindex mysql table

Question

I have a table with many rows but they are out of order. Im using the field "id" as the primary key. I also have a "date" field which is a datetime field.

How could i reindex the table so that the entries are id'd in chronological order according to the date field

Answer 1

How about something like a simple query using a variable:

set @ROW = 0;
UPDATE `tbl_example` SET `id` = @ROW := @ROW+1 ORDER BY `fld_date` ASC;

This will order your rows like: 0,1,2,4,5...etc by your date.