我必须将列值填充到' Y'如果条件为真,否则“N”#。但是,如果在hive中它不支持子查询,那么如何在HIVE中返回。
(case
when exists
(select 1
from fntable fs
join dfntable dfs
on fs.id = dfs.id
and dfs.datetime =
(select max (cd.datetime)
from dfntable cd group by id)
and fs.s_id = dfs.s_id) then 'Y'
else 'N')"
答案 0 :(得分:1)
使用具有分析函数的子查询+左连接。加入后,' Y':
select case when cd.id is not null then 'Y' else 'N' end
from fntable fs
left join
( --group by cd.id, cd.s_id and filter
select cd.id, cd.s_id
from
( select max (cd.datetime) over (partition by dc.id) as max_id_datetime,
cd.id, cd.s_id, cd.datetime
from dfntable cd
) cd
where cd.datetime=max_id_datetime --filter only records with max date
group by cd.id, cd.s_id
) cd on fs.id = dfs.id and fs.s_id = dfs.s_id