Amazon redshift 由于内部错误,不支持这种类型的相关子查询模式的红移
当我运行第一个查询时,所有查询都正常运行:Amazon redshift 由于内部错误,不支持这种类型的相关子查询模式的红移,amazon-redshift,Amazon Redshift,当我运行第一个查询时,所有查询都正常运行: select uid, (select top 1 city from UserData where UserData.uid = #uids.uid group by city) from #uids; 问题是,当我添加按计数排序(城市)时,我得到一个错误:由于内部错误,不支持这种类型的相关子查询模式 select uid, (select top 1 city from UserData where UserData.uid = #uids.u
select uid,
(select top 1 city from UserData where UserData.uid = #uids.uid
group by city)
from #uids;
问题是,当我添加按计数排序(城市)时,我得到一个错误:由于内部错误,不支持这种类型的相关子查询模式
select uid,
(select top 1 city from UserData where UserData.uid = #uids.uid
group by city
order by count(city))
from #uids;
该错误表示子查询不起作用,这一点很明显,因为不能在SQL中使用ORDER子句中的函数。只能在SELECT和HAVING子句中使用它们 如果要按
计数(城市)
订购,应将其添加到带有别名和按别名订购的SELECT子句中。因此,您的子查询可以如下所示:
(SELECT city, COUNT(*) AS city_count
FROM UserData
WHERE UserData.uid = #uids.uid
GROUP BY city
ORDER BY city_count
LIMIT 1)
我将使用红移中的
行编号()
来执行此操作:
select u.uid, ud.city
from uids u left join
(select uid, city, count(*) as cnt,
row_number() over (partition by uid order by count(*) desc) as seqnum
from UserData ud
group by uid, city
) ud
on ud.uid = u.uid and seqnum = 1;
您也可以在SQL Server中尝试此操作。“因为您不能在SQL中使用ORDER子句中的函数”。您可能需要重新检查您的索赔