[英]"NOT IN"/"NOT EXISTS" for pairwise column comparison not working in Redshift
我想用 redshift 重写下面的语句。 Redshift 不支持 IN/NOT IN 进行多列比较。 当我也使用 NOT EXISTS 尝试相同的查询时,出现以下错误:
无效操作:由于内部错误,不支持此类相关子查询模式;
select count(distinct item) from tbl1
where (item,store) not in (
select distint item, store form tbl1
where *store changed* -- some filters
)
Tim 的想法似乎很酷,但您也可以使用以下代码:
select count(distinct t1.item)
from tbl1 t1
left join
(
select distinct item, store
form tbl1
where *store changed* -- some filters
) t2
on t2.item = t1.item
and t2.store = t1.store
where t2.item is null
and t2.store is null
您的 Redshift 版本不支持此元组语法。 您可以改写如下:
SELECT COUNT(DISTINCT item) AS cnt
FROM tbl1 t1
WHERE NOT EXISTS (
SELECT 1
FROM tbl1 t2
WHERE t2.item = t1.item AND
t2.store = t1.store AND
(other filters here...)
);
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.