Comment utiliser les Alias dans la clause where?
-
27-09-2019 - |
Question
J'ai cette procédure:
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;
mais SQL Developer générer cette erreur:
Erreur(20,10):PL/SQL:ORA-00904:"EXPIRED_DATE":identifiant invalide
Je crois que PLSQL me permet d'utiliser l'Alias dans la clause where, mais il ya quelque chose que j'ai oublié?
Merci à l'avance.
La solution
Vous ne pouvez pas faire référence à l'alias de colonne dans la clause where - vos options sont les suivantes:
- répliquer le CAS énoncé dans la clause where
utiliser une sous-requête:
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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