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並前往https://www.quora.com/What-are-the-consequences-of-not-specifying-NOT-NULL-in-PostgreSQL-for-fields-which-cant-be-null

What are the consequences of not specifying “NOT NULL” in ...

In other words, the column is “nullable”: it can contain NULL markers (“NULL ... “NOT NULL” in PostgreSQL for fields which can't be null?

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