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我想在蟾蜍數據點中建立一個查詢。我有一個子查詢,它有一個行號來標識我感興趣的記錄。只有在行號爲1時,此子查詢才需要留在主表中。以下是我想要查看的查詢:如何在蟾蜍數據點查詢生成器中保持連接狀態?
SELECT distinct E.EMPLID, E.ACAD_CAREER
FROM PS_STDNT_ENRL E
LEFT JOIN (
SELECT ACAD_CAREER, ROW_NUMBER() OVER (PARTITION BY ACAD_CAREER ORDER BY EFFDT DESC) as RN
FROM PS_ACAD_CAR_TBL
) T on T.ACAD_CAREER = E.ACAD_CAREER and RN = 1
當我嘗試複製它時,行號條件放置在全局WHERE子句中。這不是預期的功能,因爲它會刪除子查詢中沒有匹配的記錄,從而使其成爲內部聯接。
這裏是它生成查詢:
SELECT DISTINCT E.EMPLID, E.ACAD_CAREER, T.RN
FROM SYSADM.PS_STDNT_ENRL E
LEFT OUTER JOIN
(SELECT PS_ACAD_CAR_TBL.ACAD_CAREER,
ROW_NUMBER()
OVER (PARTITION BY ACAD_CAREER ORDER BY EFFDT DESC)
AS RN
FROM SYSADM.PS_ACAD_CAR_TBL PS_ACAD_CAR_TBL) T
ON (E.ACAD_CAREER = T.ACAD_CAREER)
WHERE (T.RN = 1)
有沒有辦法讓查詢生成器放置該行號條件對左連接,而不是全球WHERE子句?