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An optional value just means that the value is unknown. For example, it is optional to enter the colour of the car I own. So my car colour is null. The databas
by adamzochowski 4y ago
An optional value just means that the value is unknown.
For example, it is optional to enter the colour of the car I own. So my car colour is null. The database can't confirm if my car is Red or isn't Red, because it is an unknown value.