Microsoft Access 2013 GROUP BY语法错误

Question

I am using Microsoft Access 2013, and I am trying to group the data stored in my Part table, by the Class it is stored in. I have got this query created:

SELECT Part.PartNum, Part.Description, Part.OnHand, Part.Class, Part.Warehouse, Part.Price
FROM Part
GROUP BY Part.Class
ORDER BY Part.PartNum;

The above SQL Code gives an error with Microsoft Access: "Your query does not include the specified expression 'PartNum' as part of an aggregate function". I am not sure what I am doing wrong... Should I create an extra column for the grouping?

Here is what my Part table look

Answer 1

I think you don't understand the purpose of grouping. When you group something, you have to use only grouped and aggregated columns in the select statement. For instance, the right query could be the following:

SELECT Part.PartNum, SUM(Part.Price)
FROM Part
GROUP BY Part.Class, Part.Description, Part.OnHand, Part.Class, Part.Warehouse
ORDER BY Part.PartNum;

However, I there's no any aggregated function in your select. Describe your task clearly.