选择不同的值，其中条件总和 < 值

Question

I have a problem with a SQL query. I need to get a list of all unique [Cod Angajat] field for which the sum of all entries in the column [Timp declarat] is less than 8, with the where clause. Bellow is what I've gotten so far.

In the table I have 3 rows. It returns me the same rows, instead of 1 row, for which all the conditions apply - meaning the one with [Cod Angajat] = 2.

|   Cod Angajat  |   Nume   |  Timp declarat  |
---------------------
|  1             |  Ene     | 3               |
|  1             |  Ene     | 5               |
|  2             |  Gigi    | 4               |

select COUNT(DISTINCT [Cod Angajat]), [Cod Angajat], [Nume], [Timp declarat]
FROM [SC Vermorel SRL$ProductieVE]
WHERE (sum([Timp declarat] < 8 AND cast(CONVERT(varchar(8), Data, 112) As DateTime) = @data2) and ([Schimb] = '" & ProceseazaSCH(Now()) & "' 
GROUP BY [Nume], [Cod Angajat], [Timp declarat]
HAVING sum([Timp declarat]) < 8

Answer 1

With the query you are grouping by Timp declarat which is why you have duplicates of Cod Angajat in your return set. Since everywhere else in the query is using the Sum of Timp Declarat I would assume the below is what you require:

select COUNT(DISTINCT [Cod Angajat]), [Cod Angajat], [Nume], SUM([Timp declarat]) as SumTimpDeclarat
FROM [SC Vermorel SRL$ProductieVE]
WHERE (sum([Timp declarat] < 8 AND cast(CONVERT(varchar(8), Data, 112) As DateTime) = @data2) and ([Schimb] = '" & ProceseazaSCH(Now()) & "' 
GROUP BY [Nume], [Cod Angajat]
HAVING sum([Timp declarat]) < 8

Answer 2

If you need one row per [Cod Angajat] , then that should be in the GROUP BY -- and nothing else:

SELECT [Cod Angajat], SUM([Timp declarat]
FROM [SC Vermorel SRL$ProductieVE]
WHERE CONVERT(date, Data) = @data2 AND
      ([Schimb] = '" & ProceseazaSCH(Now()) & "'
GROUP BY [Cod Angajat]
HAVING SUM([Timp declarat]) < 8;

The rest of the query simplifies as well. There is no need to convert a date/time to a string to remove the time component. And aggregation functions don't belong in the WHERE clause.