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並前往https://sqlstudies.com/2013/10/30/adding-a-column-to-a-table-with-a-default-null-vs-not-null/

Adding a column to a table with a default (NULL vs NOT NULL)

Note that the nullable column is all NULLs and the other was filled in with x's. This makes sense when you think about it. If you add a column ...

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