So verwenden Sie Alias ??in der Where-Klausel?
-
27-09-2019 - |
Frage
Ich habe dieses Verfahren:
PROCEDURE P_LOAD_EXPIRED_ACCOUNT
(
pDayDiff IN NUMBER,
ExpiredCur OUT MEGAGREEN_CUR
)
IS
BEGIN
OPEN ExpiredCur FOR
SELECT
ACCOUNT_NAME, SERVICE_TYPE,
CASE
WHEN SERVICE_TYPE = 1 THEN ADD_MONTHS(ACTIVATED_DATE,3)
WHEN SERVICE_TYPE = 2 THEN ADD_MONTHS(ACTIVATED_DATE,6)
WHEN SERVICE_TYPE = 3 THEN ADD_MONTHS(ACTIVATED_DATE,12)
END
AS EXPIRED_DATE
FROM SUBSCRIBERS
WHERE (EXPIRED_DATE - CURRENT_DATE) < pDayDiff;
END;
aber SQL Developer diese Fehler erzeugen:
Fehler (20,10): PL / SQL: ORA-00904: "EXPIRED_DATE": ungültige Kennung
Ich glaube, dass PLSQL erlaubt mir Alias ??zu verwenden, in der Where-Klausel, aber gibt es etwas, was ich vergessen habe?
Vielen Dank im Voraus.
Lösung
Sie können die Spalte Alias ??in der WHERE-Klausel verweisen - Ihre Optionen sind:
- replizieren die CASE-Anweisung in der WHERE-Klausel
-
verwenden, um eine Unterabfrage:
PROCEDURE P_LOAD_EXPIRED_ACCOUNT(pDayDiff NUMBER, ExpiredCur OUT MEGAGREEN_CUR) IS BEGIN OPEN ExpiredCur FOR SELECT x.account_name, x.service_type, x.expired_date FROM (SELECT s.account_name, s.service_type, CASE WHEN s.service_type = 1 THEN ADD_MONTHS(ACTIVATED_DATE,3) WHEN s.service_type = 2 THEN ADD_MONTHS(ACTIVATED_DATE,6) WHEN s.service_type = 3 THEN ADD_MONTHS(ACTIVATED_DATE,12) END AS EXPIRED_DATE FROM SUBSCRIBERS s) x WHERE x.expired_date - CURRENT_DATE < pDayDiff; END;
Oracle 9i +
WITH summary AS ( SELECT s.account_name, s.service_type, CASE WHEN s.service_type = 1 THEN ADD_MONTHS(ACTIVATED_DATE,3) WHEN s.service_type = 2 THEN ADD_MONTHS(ACTIVATED_DATE,6) WHEN s.service_type = 3 THEN ADD_MONTHS(ACTIVATED_DATE,12) END AS EXPIRED_DATE FROM SUBSCRIBERS s) SELECT x.account_name, x.service_type, x.expired_date FROM summary x WHERE x.expired_date - CURRENT_DATE < pDayDiff;
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