我正在使用以下查询:
select UserId, Category from customer_data
where (Category in ('Fashion','Electronics'))
and (Action in ('Click','AddToCart','Purchase'))
and customer_data.UserId not in (select ustomer_data.UserId from customer_data where customer_data.Category='Fashion' and customer_data.Category='Electronics') ;
得到以下错误:
hive> Unsupported SubQuery Expression ''Fashion'': SubQuery expression refers to Outer query expressions only.
我不确定这个错误,我是否需要为外部查询中的customer_data.Category等每个cloumn使用表名?能否请你帮忙 ?
样本数据 :
UserId,ProductId,Category,Action
1,111,Electronics,Browse
2,112,Fashion,Click
3,113,Kids,AddtoCart
4,114,Food,Purchase
5,115,Books,Logout
6,114,Food,Click
7,113,Kids,AddtoCart
8,115,Books,Purchase
9,111,Electronics,Click
10,112,Fashion,Purchase
3,112,Fashion,Click
12,113,Kids,AddtoCart
期望的输出:
Output File
• userID
• category
使用分析函数计算每个UserId的fashion_flag:
select UserId, Category
from
( --calculate User level flags
select UserId, Category,
max(fashion_flag) over (partition by UserId) as user_fashion_flag,
max(electronics_flag) over (partition by UserId) as user_electronics_flag
from
(--maybe you do not need this subquery, if case will work inside max() over
select UserId, Category,
case when Category='Fashion' then 1 else 0 end fashion_flag,
case when Category='Electronics' then 1 else 0 end electronics_flag
from customer_data
where (Category in ('Fashion','Electronics'))
and (Action in ('Click','AddToCart','Purchase'))
) s
) s
where user_fashion_flag+user_electronics_flag=1 --not allow two flags at a time
;