無法在語句中使用多個

Question

我在尋找練習和遊戲表中不存在的條目，但是我無法在語句中使用第二個條目。有沒有其他方法可以做到這一點？

select VenueID from Venue 
where VenueID not in (select VenueID from Practice) 
and not in (select VenueId from Game) 

Answer 1

您需要重複NOT IN聲明，包括列名稱：

SELECT VenueID 
FROM Venue 
WHERE VenueID NOT IN (SELECT VenueID FROM Practice) AND 
     VenueID NOT IN (SELECT VenueId FROM Game) 
     ^^^ you omitted the second column name 

One alterna傾向於使用NOT IN將做兩個左連接：

SELECT VenueID 
FROM Venue t1 
LEFT JOIN Practice t2 
    ON t1.VenueID = t2.VenueID 
LEFT JOIN Game t3 
    ON t1.VenueID = t3.VenueID 
WHERE t2.VenueID IS NULL AND 
     t3.VenueID IS NULL 

Answer 2

你在第二not in缺少列名（每個標準是不同的，其語法是<列> NOT IN> <值設置）：

select VenueID from Venue 
where VenueID not in (select VenueID from Practice) 
and VenueID not in (select VenueId from Game) 
-- ^^^^^^^