Sql 如何转置

DB:Oracle

我有几个领域

account cost1 cost2 cost3 cost4 cost5
10       $20   $30   $40   $50   $60
20       $100   $200  $300  $400 $500

要求是,

• 如果帐户是10，那么我只需要成本1和成本3

• 如果帐户是20，那么我只需要成本2和成本4

结果应该是这样的,

20----10
40----10
200----20
400----20

---

有什么建议吗？

使用

union all

：

select account, cost1 as cost
from t
where account = 10
union all
select account, cost3
from t
where account = 10
union all
select account, cost2
from t
where account = 20
union all
select account, cost4
from t
where account = 20

---

使用“全部联合”：

select account, cost1 as cost
from t
where account = 10
union all
select account, cost3
from t
where account = 10
union all
select account, cost2
from t
where account = 20
union all
select account, cost4
from t
where account = 20