UPDATE FROM WHERE子查詢SQL Server

如何從UPDATE語句使用子查詢？這裏是我的查詢：UPDATE FROM WHERE子查詢SQL Server

UPDATE car_availability 
SET availability_status = 'GOOD' 
FROM car_trip AS TRIP 
WHERE car_availability.car_no = TRIP.car_no 
AND NOT EXISTS (SELECT DISTINCT A.car_No 
       FROM car_maintenance A 
       WHERE A.car_no = TRIP.vehicle_id 
       AND start_date = TRIP.workday) 
AND EXISTS (SELECT DISTINCT B.car_No 
      FROM car_maintenance B 
      WHERE B.car_no = TRIP.vehicle_id 
      AND end_date IS NOT NULL)

我得到一個錯誤「在UPDATE子句和DELETE語句不能包含子查詢來源或加入。」

我想更新availability_status爲GOOD，其中car_maintenance存在於car_maintenance中，其start_date等於car_trip的工作日，而car_maintenance中的汽車的結束日期不爲null。

來源

2017-03-10 Robert John Martin

這是一個重複的問題，你會得到一個答案在這裏：http://stackoverflow.com/a/2334741/3270427 – McNets

@McNets - 我不能使用INNER JOIN也。我正在使用SQL Server 2016. –

仔細閱讀，您必須將'car_availability'添加到FROM子句 – McNets

正如@McNets所說，您需要將car_availability表添加到您的FROM子句中。試試這個：

UPDATE CA 
SET availability_status = 'GOOD' 
FROM car_availability CA 
JOIN car_trip AS TRIP ON CA.car_no = TRIP.car_no 
WHERE NOT EXISTS (SELECT DISTINCT A.car_No 
       FROM car_maintenance A 
       WHERE A.car_no = TRIP.vehicle_id 
       AND start_date = TRIP.workday) 
AND EXISTS (SELECT DISTINCT B.car_No 
      FROM car_maintenance B 
      WHERE B.car_no = TRIP.vehicle_id 
      AND end_date IS NOT NULL)

來源

2017-03-10 18:04:44

UPDATE FROM WHERE子查詢SQL Server

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