Select "impossible" values

[#1]

When combining two sources in a QV application containing for example:

- Product ID, Product description
- Product ID, Product price

Then I would like to create a table with Product ID, Product Description, Product Price (for example look below) and have the ability to select those product ID's without a description or a price. Unfortunately I'm unable to select them from the table or create a listbox with this option.

Product ID, Product Description, Product Price
1 Coca Cola, 2,39
2 Fanta -
3 - 1,87

[#2]

That's brilliant, exactly what I need. Thanks!