使用Group By但需要列的SQL語句總計

Question

我正在運行下面的SQL語句，但我最後需要總計。使用SQL Server

SELECT tblAllocation.Allocation AS TimeSlots, COUNT(*) AS [Applicant Total] 
FROM tblAllocation 
INNER JOIN tblRegistration ON tblAllocation.AllocationID = tblRegistration.AllocationID 
INNER JOIN tblcontact ON tblRegistration.ContactID = tblcontact.ContactID 
INNER JOIN tbladdress AS tbladdress_1 ON tblcontact.AddressID = tbladdress_1.AddressID 
INNER JOIN tblNadraRegistrationDates ON tblRegistration.NRegDateID = tblNadraRegistrationDates.NRegDateID 
WHERE (tblNadraRegistrationDates.[Nadra Reg Dates] = '26 April 2015') 
GROUP BY tblAllocation.Allocation; 

這給下面

TimeSlots  Applicant Total 
09:30 to 10:30 3 
10:30 to 11:30 10 
12:30 to 13:30 11 
Reservation  8 

TOTAL 32 <--- how can I get this 

Answer 1

使用的GROUP BY語句WITH ROLLUP選項：

SELECT 
    CASE 
     WHEN GROUPING(tblAllocation.Allocation) = 1 THEN 'Total' 
     ELSE tblAllocation.Allocation 
    END AS TimeSlots, 
    COUNT(*) AS [Applicant Total] 
FROM 
    tblAllocation 
INNER JOIN 
    tblRegistration ON tblAllocation.AllocationID = tblRegistration.AllocationID 
INNER JOIN 
    tblcontact ON tblRegistration.ContactID = tblcontact.ContactID 
INNER JOIN 
    tbladdress AS tbladdress_1 ON tblcontact.AddressID = tbladdress_1.AddressID 
INNER JOIN 
    tblNadraRegistrationDates ON tblRegistration.NRegDateID = tblNadraRegistrationDates.NRegDateID 
WHERE 
    (tblNadraRegistrationDates.[Nadra Reg Dates] = '26 April 2015') 
GROUP BY 
    tblAllocation.Allocation WITH ROLLUP; 

您可能需要使用別名表名，縮短查詢文字，並可能使其更具可讀性（但這當然只是一種意見）。

Demo SQL Fiddle