我正在尝试构建一种peddy纸。为此,我有下表:团队CREATETABLE`teams`(`id`int(11)NOTNULLAUTO_INCREMENT,`creator_id`int(11)NOTNULL,`friend_id`int(11)DEFAULTNULL,`team_name`varchar(128)NOTNULL,PRIMARYKEY(`id`));团队日志CREATETABLEIFNOTEXISTS`progress_tracker`(`id`int(8)NOTNULLAUTO_INCREMENT,`user_id`int(8)NOTNULL,`team_id`int