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我有这个程序:
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;
最佳答案
您不能在 WHERE 子句中引用列别名 - 您的选项是:
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;
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;
关于sql - 如何在 Where 子句中使用别名?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3852831/
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