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希望有人可以幫助我解決這個問題。我試圖通過ODBC/ms查詢來提取即將推出的標題列表(我在發佈中工作)。我希望(除其他外)顯示其內部狀態(批准,印前等)。數據庫存儲狀態的更改日期'。我似乎每個標題的每個狀態都有一行。所以如果標題6次改變狀態,我會得到6行。但我只想顯示最新狀態...需要只存儲表中存儲更改日期的最後日期SQL/ODBC
日期在BL_PROJECT_TO_STATUS.STATUS_DATE(我在下面插入了一個日期標準,只是爲了使其更加明顯)。
如何才能做到這一點?我對ODBC很陌生,會很感激。
SELECT DISTINCT
BL_PROJECT.EXP_PUB_DATE, BL_PROJECT.EAN, BL_PROJECT.TITEL,
MEDIATYPE.DESCRIPTION, BL_PROJECT_STATUS.DESCRIPTION
FROM
FIRMA1.BL_PROJECT BL_PROJECT, FIRMA1.BL_PROJECT_STATUS BL_PROJECT_STATUS,
FIRMA1.BL_PROJECT_TO_STATUS BL_PROJECT_TO_STATUS, FIRMA1.MEDIATYPE MEDIATYPE
WHERE
BL_PROJECT.PROJECT_ID = BL_PROJECT_TO_STATUS.PROJECT_ID AND
BL_PROJECT_TO_STATUS.STATUS_ID = BL_PROJECT_STATUS.CODE AND
BL_PROJECT.MEDIATYPE = MEDIATYPE.ID AND
((BL_PROJECT.PROJECT_TYPE = 2) AND
(BL_PROJECT.EXP_PUB_DATE Between SYSDATE AND (SYSDATE+90)) AND
(BL_PROJECT_TO_STATUS.STATUS_DATE = {ts '2013-11-20 00:00:00'}))
ORDER BY
BL_PROJECT.EXP_PUB_DATE, BL_PROJECT.EAN, BL_PROJECT.TITEL