Oracle PIVOT句のユーザー定義集計関数

Question

Oracle PIVOT句でユーザー定義集計関数を使用できません。

私はstring_aggというユーザ定義の集計関数を作成しました。私は

select * from 
( 
    select id, type, string_agg(value) as value from 
    (
     select 'user1' as id, 'BMW' as value, 'CAR'  as type from dual union 
     select 'user1' as id, 'Audi' as value, 'CAR'  as type from dual union 
     select 'user2' as id, 'Honda' as value, 'CAR'  as type from dual union 
     select 'user1' as id, 'Dell' as value, 'COMPUTER' as type from dual union 
     select 'user1' as id, 'Sony' as value, 'COMPUTER' as type from dual union 
     select 'user2' as id, 'HP' as value, 'COMPUTER' as type from dual 
    ) 
    group by id, type 
) 
PIVOT (string_agg(value) FOR id IN ('user1' user1, 'user2' user2));

は私が手ピボット句に次のように同じ機能を使用しようとただし

ID TYPE STRING_AGG(VALUE) 
user1  CAR    Audi,BMW 
user1  COMPUTER  Dell,Sony 
user2  CAR    Honda 
user2  COMPUTER  HP 

：私はのような簡単な文でそれを使用することができる午前
...で

select id, string_agg(value) from 
(
    select 'user1' as id, 'BMW' as value, 'CAR'  as type from dual union 
    select 'user1' as id, 'Audi' as value, 'CAR'  as type from dual union 
    select 'user2' as id, 'Honda' as value, 'CAR'  as type from dual union 
    select 'user1' as id, 'Dell' as value, 'COMPUTER' as type from dual union 
    select 'user1' as id, 'Sony' as value, 'COMPUTER' as type from dual union 
    select 'user2' as id, 'HP' as value, 'COMPUTER' as type from dual 
) 
group by id, type

結果エラー...

ORA-56902: expect aggregate function inside pivot operation

期待結果は...

TYPE USER1 USER2 
COMPUTER Dell,Sony HP  
CAR   Audi,BMW Honda

です

Answer 1

ピボットは同じ集約関数上である必要はありません。

select * from 
( 
    select id, type, LISTAGG(value) WITHIN GROUP (ORDER BY 1) as value from 
    (
     select 'user1' as id, 'BMW' as value, 'CAR'  as type from dual union 
     select 'user1' as id, 'Audi' as value, 'CAR'  as type from dual union 
     select 'user2' as id, 'Honda' as value, 'CAR'  as type from dual union 
     select 'user1' as id, 'Dell' as value, 'COMPUTER' as type from dual union 
     select 'user1' as id, 'Sony' as value, 'COMPUTER' as type from dual union 
     select 'user2' as id, 'HP' as value, 'COMPUTER' as type from dual 
    ) 
    group by id, type 
) 
PIVOT (max(value) FOR id IN ('user1' user1, 'user2' user2)); 

Answer 2

何wmsys.wm_concatを試みる代わりに、ユーザー定義の集約については？