適用，如果在SQL計數範圍內第

SELECT 
    Rooms.Building, 
    Count(Rooms.Room) AS TotalApartments, 
    Count(Rooms.Room) AS ApartmentsOccupied 
FROM 
    Rooms 
WHERE 
    (((Rooms.AssetType) <> 'LC')) 
GROUP BY 
    Rooms.Building;

我想算Rooms.Room凡Rooms.Occupied = True（ApartmentsOccupied），但是當我把這個條款列入我的SQL它也適用在哪裏的TotalApartments列適用，如果在SQL計數範圍內第

來源

2014-10-07 Dylan Kramer

'計數（案件房間。房間時，真的，然後1結束）AS ApartmentsOccupied'。當然取決於什麼「sql」是「sql」。 – mustaccio 2014-10-07 19:00:33

而不是在哪裏，嘗試使用COUNT（Rooms.ROOM）> 0或沿着這些線的東西。 – RazorSky 2014-10-07 19:00:50

你可以這樣做

SELECT 
    Building, 
    Count(Room) AS TotalApartments, 
    SUM(CASE WHEN Occupied = True THEN 1 ELSE 0 END) AS ApartmentsOccupied 
FROM 
    Rooms 
WHERE 
    AssetType <> 'LC' 
GROUP BY 
    Building;

來源

2014-10-07 19:03:34 Rahul

您可以將一些邏輯到CASE語句進行條件摘要：

SELECT 
    Rooms.Building, 
    Count(Rooms.Room) AS TotalApartments, 
    Sum(CASE WHEN Rooms.Occupied = True THEN 1 ELSE 0 END) AS ApartmentsOccupied 
FROM 
    Rooms 
WHERE 
    (((Rooms.AssetType) <> 'LC')) 
GROUP BY 
    Rooms.Building;

我不知道把我的頭頂部，但您可能需要更改計的款項，以及：

Sum(1) AS TotalApartments

而且交替，在一些SQL方言的「真」值是1，所以你可以得到這樣的事情佔用的計數：

Sum(Rooms.Occupied) AS ApartmentsOccupied

來源

2014-10-07 19:03:50

適用，如果在SQL計數範圍內第

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