在存储过程中将 COALESCE 转换为 INT

Question

我目前有一个存储过程，它返回数据并显示在我的报告查看器中，但我的问题是我检查学生是否参加了课程，

COALESCE(A.Attended, 0)AS Attended

如果他们参加了，则返回 1，如果没有，则返回 0 - 仅在我的报告中显示 1 或 0，即使他们可以参加多次。我怎样才能将其转换为 int 以获得正确的总数。

谢谢

整个查询：

SELECT 
    P.PartyId,
    COUNT(COALESCE(A.Attended, 0))AS Attended,
    COUNT(DISTINCT H.HearingId) AS Hearings,
    O.OfficeName As OfficeName,
    CO.Name,
    P.FirstName AS FirstName,
    P.LastName AS LastName,
    P.BirthDate AS DOB
FROM Activity A 
INNER JOIN ActivityType AT On A.ActivityTypeId = AT.ActivityTypeId
INNER JOIN ActivityEntry AE ON A.ActivityEntryId = AE.ActivityEntryId
INNER JOIN HearingEntry HE ON CAE.HearingEntryId = HE.HearingEntryId
INNER JOIN Hearing H ON HE.HearingEntryId = H.HearingEntryId
INNER JOIN [Case] C ON H.CaseId = C.CaseId
INNER JOIN CaseOffice CO ON C.CaseId = CO.CaseId AND AE.OfficeId = CO.OfficeId
INNER JOIN Office O ON CO.OfficeId = O.OfficeId
INNER JOIN Attended A ON H.HearingId = A.HearingId
INNER JOIN Party P ON A.PartyId = P.PartyId
WHERE HP.PartyId = P.PartyId AND AE.OfficeId = @OfficeId AND(H.HearingDate >= @BeginDate AND (H.HearingDate <= @EndDate OR H.HearingDate IS NULL)) AND HE.HearingEntryId = CAE.HearingEntryId
GROUP BY P.PartyId, A.Attended, O.OfficeName,CO.Name,P.FirstName, P.LastName,P.BirthDate

Answer 1

您需要按参加进行求和。

SELECT 
    P.PartyId,
    (SUM(COALESCE(A.Attended, 0)))AS Attended,
    COUNT(DISTINCT H.HearingId) AS Hearings,
    O.OfficeName As OfficeName,
    CO.Name,
    P.FirstName AS FirstName,
    P.LastName AS LastName,
    P.BirthDate AS DOB
FROM Activity A 
INNER JOIN ActivityType AT On A.ActivityTypeId = AT.ActivityTypeId
INNER JOIN ActivityEntry AE ON A.ActivityEntryId = AE.ActivityEntryId
INNER JOIN HearingEntry HE ON CAE.HearingEntryId = HE.HearingEntryId
INNER JOIN Hearing H ON HE.HearingEntryId = H.HearingEntryId
INNER JOIN [Case] C ON H.CaseId = C.CaseId
INNER JOIN CaseOffice CO ON C.CaseId = CO.CaseId AND AE.OfficeId = CO.OfficeId
INNER JOIN Office O ON CO.OfficeId = O.OfficeId
INNER JOIN Attended A ON H.HearingId = A.HearingId
INNER JOIN Party P ON A.PartyId = P.PartyId
WHERE HP.PartyId = P.PartyId AND AE.OfficeId = @OfficeId AND(H.HearingDate >= @BeginDate AND (H.HearingDate <= @EndDate OR H.HearingDate IS NULL)) AND HE.HearingEntryId = CAE.HearingEntryId
GROUP BY P.PartyId, O.OfficeName,CO.Name,P.FirstName, P.LastName,P.BirthDate

Answer 2

我猜你的意思是 A.Attented 是一个位，而你希望它是一个 int，以便稍后可以聚合？

您可以将 bit 转换为 int，如下所示：

CAST(A.Attented AS INT)

或者在本例中：

COALESCE(CAST(A.Attended AS INT), 0) AS Attended