我想计算占用的住宿总数占可用住宿总数的百分比。我正在使用下面的查询。我不认为查询是正确的。它在 From 附近返回错误。请任何人都可以帮助
SELECT ((COUNT(Accommodation.dbo.House.HouseID) / COUNT(B.HouseID)) * 100) AS [Accommodation Utilisation %]
FROM (SELECT COUNT(B.HouseID)
FROM Accommodation.dbo.House B
WHERE Accommodation.dbo.House.STATUS = 'Occupied')
FROM Accommodation.dbo.House
似乎更简单的方法是使用条件AVG：
SELECT AVG(CASE H.STATUS WHEN 'Occupied' THEN 1. ELSE 0. END) AS Utilisation --Don't use names that need to be delimit identified.
FROM dbo.House H; --You should already be connnected to the database Accomodation, so it doesn't need to appear here
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我来说两句