如果通过 window 函数,有没有更好的方法来 Return 多行的 1 个值?
Any better way to Return 1 value for multiple row in case when by window Function?
这样的数据:
timestamp id roas
day 5 id1 1.3
day 4 id1 2.1
day 3 id1 1.9
day 2 id1 1.4
day 1 id1 3.0
我想获取第一天的数据,当所有行的 roas < = 1.5 有 'id1',即 day 2
,期望的结果:
timestamp id roas min_date
day 5 id1 1.3 day 2
day 4 id1 2.1 day 2
day 3 id1 1.9 day 2
day 2 id1 1.4 day 2
day 1 id1 3.0 day 2
目前,我使用:
, t2 as (select *, case when roas < = 1.5 then timestamp else null end as day_roas from t1)
select *, min(day_roas) over (partition by id) as min_date
from t2
您可以使用 FILTER
clause with your window function:
SELECT *, min(timestamp) FILTER (WHERE roas <= 1.5) OVER (PARTITION BY id) FROM t1
这样的数据:
timestamp id roas
day 5 id1 1.3
day 4 id1 2.1
day 3 id1 1.9
day 2 id1 1.4
day 1 id1 3.0
我想获取第一天的数据,当所有行的 roas < = 1.5 有 'id1',即 day 2
,期望的结果:
timestamp id roas min_date
day 5 id1 1.3 day 2
day 4 id1 2.1 day 2
day 3 id1 1.9 day 2
day 2 id1 1.4 day 2
day 1 id1 3.0 day 2
目前,我使用:
, t2 as (select *, case when roas < = 1.5 then timestamp else null end as day_roas from t1)
select *, min(day_roas) over (partition by id) as min_date
from t2
您可以使用 FILTER
clause with your window function:
SELECT *, min(timestamp) FILTER (WHERE roas <= 1.5) OVER (PARTITION BY id) FROM t1