mysql添加列
alter table table_name
add column col_name type default'';
#////
alter table actor
add column create_date datetime not null default '2020-10-01 00:00:00';
mysql添加列
alter table table_name
add column col_name type default'';
#////
alter table actor
add column create_date datetime not null default '2020-10-01 00:00:00';