insert into singer(singername)
select singer
from flashsky
where (district='大陆' or district='港台' or
district='国外') and singer<>''
group by singer
or
insert into singer(singername)
select distinct singer
from flashsky
where (district='大陆' or district='港台' or
district='国外') and singer<>''
select singer
from flashsky
where (district='大陆' or district='港台' or
district='国外') and singer<>''
group by singer
or
insert into singer(singername)
select distinct singer
from flashsky
where (district='大陆' or district='港台' or
district='国外') and singer<>''
insert into singer (singername) select singer from flashsky where (district='大陆' or district='港台' or
district='国外') and singer<>'' group by singer
district='国外') and singer<>'' group by singer )
district='国外') and singer<>'' group by singer )