1 題目描述

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?顯示找到非禁止的用戶和司機，在指定日期內grouping一下。然后考慮是否cancel的情況。

select Request_at as Day, ROUND(SUM((IF(Status ='completed',0,1)))/COUNT(Status),2) as 'Cancellation Rate' FROM Trips WHERE Client_Id IN(Select Users_Id From Users Where Banned = 'No' AND Role='client')AND Driver_Id IN(Select Users_Id From Users Where Banned = 'No' AND Role='driver')AND Request_at BETWEEN '2013-10-01' AND '2013-10-03' GROUP BY Request_at

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