如何根据现有列中存储的类型在HIVE中创建新列?
例如,我有:
id ProductType
1 car
2 bike
3 truck
我希望:
id car bike truck
1 1 null null
2 null 1 null
3 null null 1
答案 0 :(得分:0)
Use `case` statement to convert values into columns:
select id, case when ProductType = 'car' then 1 end as car,
case when ProductType = 'bike' then 1 end as bike,
case when ProductType = 'truck' then 1 end as truck
from your_table;
OK
id car bike truck
1 1 NULL NULL
2 NULL 1 NULL
3 NULL NULL 1
Time taken: 35.442 seconds, Fetched: 3 row(s)