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请问 这样的sql怎么写
例如表有字段id pageid tagid
我想要的是在表中找pageid等于指定值，而且其tagid值在表中只有一个的id集合
想了很久也想不到
请教了
我想要的是在表中找pageid等于指定值，而且其tagid值在表中只有一个的id集合
想了很久也想不到
请教了
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cloudgamer 2007-12-17
我有个方法
delete from [tag] where id in(select tagid from [tagmap] where tagid in(select tagid from [tagmap] where pageid=@info_id) group by tagid having count(*)=1)
这个是能实现的
但好像效率好像很差啊
delete from [tag] where id in(select tagid from [tagmap] where tagid in(select tagid from [tagmap] where pageid=@info_id) group by tagid having count(*)=1)
这个是能实现的
但好像效率好像很差啊
cloudgamer 2007-12-17
我试过
delete from [tag] where id in(select tagid from [tagmap] where pageid=@info_id group by tagid having count(*)=1)
但 group by tagid having count(*)=1 是没有效的
好像是先pageid=@info_id的结果再group by
但我想要的结果是group by是对整个表的
谢谢了
delete from [tag] where id in(select tagid from [tagmap] where pageid=@info_id group by tagid having count(*)=1)
但 group by tagid having count(*)=1 是没有效的
好像是先pageid=@info_id的结果再group by
但我想要的结果是group by是对整个表的
谢谢了
liangCK 2007-12-17
delete from [tag] where id in(select id
from table
where paggeid = ??
group by id
having count(1) = 1)cloudgamer 2007-12-17
说错了应该是
我想要的是在表中找pageid等于指定值，而且其tagid值在表中只有一个的tagid集合
我想要的是在表中找pageid等于指定值，而且其tagid值在表中只有一个的tagid集合
fa_ge 2007-12-17
delete t
where id in (select id from t2)
and pageid=???
where id in (select id from t2)
and pageid=???
jinjazz 2007-12-17
select * from xx where pageid='aa'
where tagid in(select tagid from xxx where pageid='aa' group by tagid having(count(*)=1))
where tagid in(select tagid from xxx where pageid='aa' group by tagid having(count(*)=1))
cloudgamer 2007-12-17
我的目的是
delete from [tag] where id in(这个集合)
或者能做到同样效果的也行
谢谢了
delete from [tag] where id in(这个集合)
或者能做到同样效果的也行
谢谢了
-狙击手- 2007-12-17
select id
from table
where paggeid = ??
group by id
having count(1) = 1