Distinct LISTAGG, die innerhalb einer Unterabfrage in der SELECT-Liste ist

Question

Hier ist ein minimales Arbeits Beispiel dafür, was ich versuche, ich bin immer zu tun und was:

ich eine Abfrage habe wie folgt:

/* 
with tran_party as -- ALL DUMMY DATA ARE IN THESE CTE FOR YOUR REFERENCE 
     (select 1 tran_party_id, 11 transaction_id, 101 team_id_redirect 
      from dual 
      union all 
      select 2, 11, 101 from dual 
      union all 
      select 3, 11, 102 from dual 
      union all 
      select 4, 12, 103 from dual 
      union all 
      select 5, 12, 103 from dual 
      union all 
      select 6, 12, 104 from dual 
      union all 
      select 7, 13, 104 from dual 
      union all 
      select 8, 13, 105 from dual), 
    tran as 
     (select 11 transaction_id, 1001 account_id, 1034.93 amount from dual 
      union all 
      select 12, 1001, 2321.89 from dual 
      union all 
      select 13, 1002, 3201.47 from dual), 
    account as 
     (select 1001 account_id, 111 team_id from dual 
      union all 
      select 1002, 112 from dual), 
    team as 
     (select 101 team_id, 'UUU' as team_code from dual 
      union all 
      select 102, 'VV' from dual 
      union all 
      select 103, 'WWW' from dual 
      union all 
      select 104, 'XXXXX' from dual 
      union all 
      select 105, 'Z' from dual) 
-- */ 
-- The Actual Query 
select a.account_id, 
     t.transaction_id, 
     (select listagg (tm_redir.team_code, ', ') 
        within group (order by tm_redir.team_code) 
      from tran_party tp_redir 
       inner join team tm_redir 
        on tp_redir.team_id_redirect = tm_redir.team_id 
       inner join tran t_redir 
        on tp_redir.transaction_id = t_redir.transaction_id 
     where  t_redir.account_id = a.account_id 
       and t_redir.transaction_id != t.transaction_id) 
      as teams_redirected 
    from tran t inner join account a on t.account_id = a.account_id; 

HINWEIS:tran_party.team_id_redirect ist ein Fremdschlüssel, team.team_id verweist.

Stromausgang:

ACCOUNT_ID TRANSACTION_ID TEAMS_REDIRECTED 
---------- -------------- ---------------- 
1001  11    WWW, WWW, XXXXX 
1001  12    UUU, UUU, VV 
1002  13 

Erwartete Ausgabe:

ich die wiederholten Elemente in TEAMS_REDIRECTED Spalte wollen nur einmal ausgewählt werden, wie folgt aus:

ACCOUNT_ID TRANSACTION_ID TEAMS_REDIRECTED 
---------- -------------- ---------------- 
1001  11    WWW, XXXXX 
1001  12    UUU, VV 
1002  13 

Was ich versuchte:

Statt direkt von tran_party Auswahl, schrieb ich eine Inline-Ansicht, die verschiedenen Werte von tran_party wie folgt wählt:

select a.account_id, 
     t.transaction_id, 
     (select listagg (tm_redir.team_code, ', ') 
        within group (order by tm_redir.team_code) 
      from (select distinct transaction_id, team_id_redirect -- Note this inline view 
        from tran_party) tp_redir 
       inner join team tm_redir 
        on tp_redir.team_id_redirect = tm_redir.team_id 
       inner join tran t_redir 
        on tp_redir.transaction_id = t_redir.transaction_id 
     where  t_redir.account_id = a.account_id 
       and t_redir.transaction_id != t.transaction_id) 
      as teams_redirected 
    from tran t inner join account a on t.account_id = a.account_id; 

Während dies mir die erwartete Ausgabe nicht geben, wenn ich Diese Lösung in meinem tatsächlichen Code dauert etwa 13 Sekunden, um nur eine Zeile zu erhalten. Also kann ich nicht das verwenden, was ich schon versucht habe.

Jede Hilfe wird geschätzt.

Answer 1

Das folgende Verfahren wird die in-line Ansicht rid Duplikate zu holen, es nutzt REGEXP_REPLACERTRIM und auf der LISTAGG Funktion das eindeutige Ergebnis im aggregated list gesetzt zu bekommen. Somit wird nicht mehr als ein Scan durchgeführt.

dieses Stück Code hinzufügen,

RTRIM(REGEXP_REPLACE(listagg (tm_redir.team_code, ',') 
        WITHIN GROUP (ORDER BY tm_redir.team_code), 
        '([^,]+)(,\1)+', '\1'), 
        ',') 

Modified query-

SQL> with tran_party as -- ALL DUMMY DATA ARE IN THESE CTE FOR YOUR REFERENCE 
    2   (select 1 tran_party_id, 11 transaction_id, 101 team_id_redirect 
    3    from dual 
    4   union all 
    5   select 2, 11, 101 from dual 
    6   union all 
    7   select 3, 11, 102 from dual 
    8   union all 
    9   select 4, 12, 103 from dual 
10   union all 
11   select 5, 12, 103 from dual 
12   union all 
13   select 6, 12, 104 from dual 
14   union all 
15   select 7, 13, 104 from dual 
16   union all 
17   select 8, 13, 105 from dual), 
18  tran as 
19   (select 11 transaction_id, 1001 account_id, 1034.93 amount from dual 
20   union all 
21   select 12, 1001, 2321.89 from dual 
22   union all 
23   select 13, 1002, 3201.47 from dual), 
24  account as 
25   (select 1001 account_id, 111 team_id from dual 
26   union all 
27   select 1002, 112 from dual), 
28  team as 
29   (select 101 team_id, 'UUU' as team_code from dual 
30   union all 
31   select 102, 'VV' from dual 
32   union all 
33   select 103, 'WWW' from dual 
34   union all 
35   select 104, 'XXXXX' from dual 
36   union all 
37   select 105, 'Z' from dual) 
38 -- The Actual Query 
39 select a.account_id, 
40   t.transaction_id, 
41   (SELECT RTRIM(
42   REGEXP_REPLACE(listagg (tm_redir.team_code, ',') 
43      WITHIN GROUP (ORDER BY tm_redir.team_code), 
44    '([^,]+)(,\1)+', '\1'), 
45   ',') 
46   from tran_party tp_redir 
47     inner join team tm_redir 
48      on tp_redir.team_id_redirect = tm_redir.team_id 
49     inner join tran t_redir 
50      on tp_redir.transaction_id = t_redir.transaction_id 
51   where  t_redir.account_id = a.account_id 
52     and t_redir.transaction_id != t.transaction_id) 
53    AS teams_redirected 
54 from tran t inner join account a on t.account_id = a.account_id 
55/

ACCOUNT_ID TRANSACTION_ID TEAMS_REDIRECTED 
---------- -------------- -------------------- 
     1001    11 WWW,XXXXX 
     1001    12 UUU,VV 
     1002    13 

SQL>