Java代碼 //把User表中相關字段的記錄并入到UserAdditionalInfo表中 insert tbl_user_additional_info (user_id,country,address,postal_code,phone,edu_background) select user_id,country,address,postal_code,phone,edu_background from tbl_user where user_id not in(select user_id from tbl_user_additional_info); //更改User表的結構 alter table tbl_user drop user_id, drop country, drop address, drop postal_code, drop phone, drop edu_background; ##############################