The column or columns of a PRIMARY KEY may contain null values.
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Q7: Frequently,NOT NULL and CHECK constraints are not
Q8: Columns with null values are ignored by
Q9: Application constraints cannot be fine-tuned for each
Q10: Modifications to the database are affected by
Q11: A table can have more than one
Q13: A FOREIGN KEY constraint that is defined
Q14: The PRIMARY KEY constraint is not important
Q15: Although CHECK constraints can check multiple conditions,it
Q16: A table can have multiple PRIMARY KEY
Q17: Triggers are at the database level and
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