Hi! Thanks for have a look at me. I got some problem followed, thanks...... Because of deleting some data from a table, and I got the uncountinued index number. Yesterday, I tried to alter the table to delete a auto_increment and primary key column named "my_num" , and I rebuilt a new auto_increment primary key the same named "my_num". I type the follwed two command: mysql> alter table bk_user drop my_num; mysql> alter table bk_user add my_num int auto_increment primary key; I would just like to reset the auto_increment and primary key started form No.1 but faild. It always appears the number that start after the ended and last number of the column that you deleted . (for example :30215 to start ) I just could not get the new fresh index number from " 1 " . Could any one tell me how I can reolve the problem? Thanks a lot ! Fongming from Taiwan. 2001/2/10