將某列的默認值由NULL改爲0,
alter TABLE app_reg_user_per_day alter column app_reg_user_cnt set default 0;
alter TABLE app_recharge_amount_per_day alter column app_recharge_amount set default 0;
將某列的默認值由NULL改爲0,
alter TABLE app_reg_user_per_day alter column app_reg_user_cnt set default 0;
alter TABLE app_recharge_amount_per_day alter column app_recharge_amount set default 0;