Oracle - 根据列值

Question

我有下表，我希望根据每个 CONTRACT_ID 可用的 TYPE 的数量获得结果。

表格

______________________________________________________________________________________
|Source             |   CONTRACT_ID |   TYPE        |   ADDRESS |   PHONE           |
______________________________________________________________________________________
|Source1            |   1234        |   INSURED     |   unique1 |   4321            |
______________________________________________________________________________________
|Source1            |   1234        |   INSURED     |   unique1 |   4321            |
______________________________________________________________________________________
|Source1            |   1234        |   DRIVER      |   unique1 |   4321            |
______________________________________________________________________________________
|Source1            |   1234        |   INSURED     |   unique1 |   4321            |
______________________________________________________________________________________
|Source2            |   2345        |   INSURED     |   unique2 |   5678            |
______________________________________________________________________________________
|Source2            |   2345        |   DRIVER      |   unique2 |   5678            |
______________________________________________________________________________________
|Source2            |   2345        |   CONTRACT    |   unique2 |   5678            |
______________________________________________________________________________________

结果：

______________________________________________________________________________________
|Source             |   CONTRACT_ID |   ROLES       |   ADDRESS |   PHONE           |
______________________________________________________________________________________
|Source1            |   1234        |   2           |   unique1 |   4321            |
______________________________________________________________________________________
|Source2            |   2345        |   3           |   unique2 |   5678            |
______________________________________________________________________________________

，结果表中的 ROLES 列应为不同 CONTRACT_ID 的不同 TYPE 的数量。

有人可以帮忙吗？

Answer 1

SELECT max(source) , contract_id ,
count( DISTINCT type) roles , max(address), max(phone) 
FROM Table group by contract_id ;

Answer 2

我认为您正在寻找count(distinct)：

select Source, CONTRACT_ID, ADDRESS, PHONE, count(distinct type) as roles
from t
group by Source, CONTRACT_ID, ADDRESS, PHONE  ;

这不是＆＃34;过滤＆＃34;。它是＆＃34;聚合＆＃34;。