For example Production.Product table records
| Class | Color | ProductNumber |
| cl1 | Null | Null |
| cl2 | Null | Null |
| Null | co3 | Null |
| Null | co4 | Null |
| Null | Null | pn5 |
| cl6 | co6 | Null |
| cl7 | co7 | pn7 |
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