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Databases Modifying Data with SQL Adding Data to a Database Adding a Row to a Table

Where do you set whether a value can be NULL in this SQL Playground?

The example says that the Schema has been set so that all values with the exception of the return date, cannot be set to null.

Accessing the schema in the SQL DB, I see no settings for this or indication. Is it not visible because this is a virtual system set up for the purposes of the examples or am I missing something?