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並前往https://support.unicomsi.com/manuals/soliddb/100/SQL_Guide/2_GettingStartedSQL.03.10.html

NULL IS NOT NULL (or “how to say 'none of the above' in SQL”)

SQL uses the keyword NULL to represent “Unknown” or “No Value”. ... INSERT INTO composers (id, name, address) VALUES (5, 'Mitchell', NULL);.

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