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SQL Server: NULL và NOT NULL

SQL Server: NULL và NOT NULL

Đặc trưng của khả năng Null của một cột quyết định các hàng trong bảng có thể chứa một giá trị Null cho cột đó. Khả năng Null của một cột có thể được định

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SQL: IS NULL Condition

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SQL: IS NULL Condition

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