What Will Happen If You Try to Use the INSERT

question 126

Multiple Choice

What will happen if you try to use the INSERT command to insert a NULL value into a column that has been assigned a PRIMARY KEY constraint? ​

• A) ​The command will execute because a PRIMARY KEY value can be NULL.
• B) ​An error message is returned and the row is not added to the table.
• C) ​The command will execute because only a UNIQUE constraint forbids NULL values.
• D) ​An error message is returned but the unaffected portion of the row is added to the table.

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