Question

I have stored count(ProductQuantity) into a list. As each ProductID have different count(ProductQuantity), i am trying to retrieve the ProductID based on the count(ProductQuanity).

  For Each i In sumofpquantity()

    Dim sq As String = "SELECT ProductID From OrderDetail Where COUNT(ProductQuantity)= " & i & ""
        Dim cmd2 As SqlCommand = New SqlCommand(sq, connection12)
        Dim reading As SqlDataReader = cmd2.ExecuteReader()
        While reading.Read()

            list.Add(reading.GetInt32(reading.GetOrdinal("ProductID")))

        End While
        reading.Close()
    Next i

sumofpquantity() is the method to store the count(ProductQuanity)

What is the correct sql statement to retrieve the productid based on the count(ProductQuantity)

Answer 1

So you want the records with a given quantity, then simply remove the COUNT:

Dim sq = "SELECT ProductID From OrderDetail Where ProductQuantity = " & i 

COUNT is an aggregate-function. So you would need a GROUP BY ProductID for example. You cannot count something that is already a single numeric value.