Inner Join gleichen Tabelle Syntaxfehler

Question

Ich versuche, eine innere Verbindung zwischen dieser Tabelle auszuführen. Was ist falsch an meiner Syntax?

(SELECT user_key, bill_number, MAX(payment_date) AS payment_date 
FROM billpayment) bpt 
INNER JOIN (SELECT * FROM billpayment) bp 
    ON bp.user_key=bpt.user_key 
    AND bp.bill_number=bpt.bill_number 
    AND bp.payment_date=bpt.payment_date 
GROUP BY user_key, bill_number; 

Er sagt, dass der SQL-Befehl nicht richtig an der Klammer in beendet 'billpayment)'

Answer 1

SELECT 
    user_key, 
    bill_number, 
    MAX(payment_date) AS payment_date 
    FROM billpayment bpt 
    INNER JOIN billpayment bp 
    ON bp.user_key=bpt.user_key 
    AND bp.bill_number=bpt.bill_number AND bp.payment_date=bpt.payment_date 
    GROUP BY 
    user_key, bill_number 

; 

Answer 2

On Oracle Versuchen Sie folgendes:

SELECT * 
    FROM (SELECT user_key, bill_number, MAX (payment_date) AS payment_date FROM billpayment) bpt 
     INNER JOIN billpayment bp 
      ON bp.user_key = bpt.user_key AND bp.bill_number = bpt.bill_number AND bp.payment_date = bpt.payment_date 
    GROUP BY user_key, bill_number; 

Kann es bisher nicht testen, ohne die Tabellenstruktur .

Answer 3

Wie wäre es nur mit analytischen Funktionen?

select bp.*, 
     max(bp.paymentdate) over (partition by user_key, bill_number) as max_payment_date 
from billpayment 

Wenn Sie die Felder auf der max Zahlungstermin wollen:

select bp.* 
from (select bp.*, 
      max(bp.paymentdate) over (partition by user_key, bill_number) as max_paymentdate 
     from billpayment 
    ) bp 
where paymentdate = max_paymentdate; 

Answer 4

Auf mySQL, können Sie versuchen, so etwas wie:

SELECT bpt.user_key, bpt.bill_number, MAX(bpt.payment_date) AS payment_date 
FROM billpayment bpt 
INNER JOIN (SELECT * FROM billpayment) bp 
    ON bp.user_key=bpt.user_key 
    AND bp.bill_number=bpt.bill_number 
    AND bp.payment_date=bpt.payment_date 
GROUP BY bpt.user_key, bpt.bill_number;