SQL：非单组群 function

Question

I am writing a SQL statement through VBA. When typing in the product origin in a textbox, it will retrieve all product IDs from the same origin and their average price. Below is my SQL statement:

SQL = "SELECT PRO_ID, AVG(PRO_PRICE_ " & _
      "FROM PRODUCT " & _
      "GROUP BY PRO_ORIGIN = '" & Label1.Value & "'"

It gives me an error SQL: not a single-group group function. How can I fix this error?

Answer 1

Your PRO_ORIGIN condition should be in a WHERE clause, and you should be grouping by PRO_ID :

SQL = "SELECT PRO_ID, AVG(PRO_PRICE) " & _
      "FROM PRODUCT " & _
      "WHERE PRO_ORIGIN = '" & Label1.Value & "' " & _
      "GROUP BY PRO_ID"

Also you have a typo, AVG(PRO_PRICE_ should be AVG(PRO_PRICE) .