Error in GROUP BY clause. Unable to parse query text

Question

I have a complex SQL statement that I fall upon an error. They prompted me this error: Error in GROUP BY expression. Can't parse query text.

I pasted this SQL statement which causes this error. Can anyone advise me where went wrong? Any ideas???

SELECT        AllocationDate, LocationName, StationName, Hour1, Hour2, Hour3, Hour4, Hour5, Hour6, Hour7, Hour8, Hour9, Hour10, Hour11, Hour12, EmpName, ShiftTime, 
                     BreakTime, SignIn, SignOut
FROM            (SELECT        z.AllocationDate, z.LocationName, z.StationName, a.Hour1, b.Hour2, c.Hour3, d .Hour4, e.Hour5, f.Hour6, g.Hour7, h.Hour8, i.Hour9, j.Hour10, k.Hour11, 
                                                l.Hour12, m.EmpName, m.ShiftTime, m.BreakTime, m.SignIn, m.SignOut
                      FROM            (SELECT DISTINCT AllocationDate, LocationName, StationName
                                                FROM            satsschema.viewmain
                                                WHERE        (StationName IS NOT NULL)) z LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour1
                                                      FROM            satsschema.view00000100) a ON z.LocationName = a.LocationName AND z.StationName = a.StationName AND 
                                                z.AllocationDate = a.AllocationDate LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour2
                                                      FROM            satsschema.view01000200) b ON z.LocationName = b.LocationName AND z.StationName = b.StationName AND 
                                                z.AllocationDate = b.AllocationDate LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour3
                                                      FROM            satsschema.view02000300) c ON z.LocationName = c.LocationName AND z.StationName = c.StationName AND 
                                                z.AllocationDate = c.AllocationDate LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour4
                                                      FROM            satsschema.view03000400) d ON z.LocationName = d .LocationName AND z.StationName = d .StationName AND 
                                                z.AllocationDate = d .AllocationDate LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour5
                                                      FROM            satsschema.view04000500) e ON z.LocationName = e.LocationName AND z.StationName = e.StationName AND 
                                                z.AllocationDate = e.AllocationDate LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour6
                                                      FROM            satsschema.view05000600) f ON z.LocationName = f.LocationName AND z.StationName = f.StationName AND 
                                                z.AllocationDate = f.AllocationDate LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour7
                                                      FROM            satsschema.view06000700) g ON z.LocationName = g.LocationName AND z.StationName = g.StationName AND 
                                                z.AllocationDate = g.AllocationDate LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour8
                                                      FROM            satsschema.view07000800) h ON z.LocationName = h.LocationName AND z.StationName = h.StationName AND 
                                                z.AllocationDate = h.AllocationDate LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour9
                                                      FROM            satsschema.view08000900) i ON z.LocationName = i.LocationName AND z.StationName = i.StationName AND 
                                                z.AllocationDate = i.AllocationDate LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour10
                                                      FROM            satsschema.view09001000) j ON z.LocationName = j.LocationName AND z.StationName = j.StationName AND 
                                                z.AllocationDate = j.AllocationDate LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour11
                                                      FROM            satsschema.view10001100) k ON z.LocationName = k.LocationName AND z.StationName = k.StationName AND 
                                                z.AllocationDate = k.AllocationDate LEFT OUTER JOIN
                                                    (SELECT DISTINCT AllocationDate, LocationName, StationName, Hour12
                                                      FROM            satsschema.view11001200) l ON z.LocationName = l.LocationName AND z.StationName = l.StationName AND 
                                                z.AllocationDate = l.AllocationDate LEFT OUTER JOIN
                                                    (SELECT        a.EmpName, CONCAT(b.StartTime, ' - ', b.EndTime) AS ShiftTime, CONCAT(a.EmpTime, ' - ', ADDTIME(a.EmpTime, '0 1:0:0.000000')) 
                                                                                AS BreakTime, a.Break, a.EmployeeOnBreak, '' AS SignIn, '' AS SignOut
                                                      FROM            satsschema.employeeslot a, satsschema.ufis b
                                                      WHERE        a.UFISEmpGroup = b.UFISID 
                                                     GROUP BY EmpName) m) Morning
WHERE        (AllocationDate = @AllocationDate) AND (LocationName = @LocationName) AND (StationName <> '') AND (Break = 1)
GROUP BY StationName, LocationName, AllocationDate

Answer 1

I think you are mixing a lot of concepts. You can't use a group by without an aggregation function like Min, Max, Avg, etc.

If you want to use Group By, you have to tell what to do with these non aggregated fields:

Hour1, Hour2, Hour3, Hour4, Hour5, Hour6, Hour7, Hour8, Hour9, Hour10, Hour11, Hour12, EmpName, ShiftTime, BreakTime, SignIn, SignOut

I think that what you want is an ORDER BY and not a GROUP BY.

Answer 2

Only Aggregate function or grouped columns can be selected in outer query, if you wanna do this. You can use that columns in group by.

... GROUP BY AllocationDate, LocationName, StationName, Hour1, Hour2, Hour3, Hour4, Hour5, Hour6, Hour7, Hour8, Hour9, Hour10, Hour11, Hour12, EmpName, ShiftTime, BreakTime, SignIn, SignOut

Thanks.