第一种:
ALTER TABLE actor ADD unique uniq_idx_firstname (first_name); alter table actor add index idx_lastname (last_name)
第二种:
create unique index uniq_idx_firstname on actor (first_name); create index idx_lastname on actor (last_name)
第一种:
ALTER TABLE actor ADD unique uniq_idx_firstname (first_name); alter table actor add index idx_lastname (last_name)
第二种:
create unique index uniq_idx_firstname on actor (first_name); create index idx_lastname on actor (last_name)