What does the notnull integrity constraint do?(a) It ensures that at least one tuple is present in the relation(b) It ensures that at least one foreign key is present in the relation(c) It ensures that all tuples have a finite value on a specified attribute(d) It ensures that all tuples have finite attributes on all the relationsI have been asked this question in an online interview.I need to ask this question from SQL Data definition topic in division Introduction to Relational Model and Sql of RDBMS

What does the notnull integrity constraint do?(a) It ensures that at l

1.	What does the notnull integrity constraint do?(a) It ensures that at least one tuple is present in the relation(b) It ensures that at least one foreign key is present in the relation(c) It ensures that all tuples have a finite value on a specified attribute(d) It ensures that all tuples have finite attributes on all the relationsI have been asked this question in an online interview.I need to ask this question from SQL Data definition topic in division Introduction to Relational Model and Sql of RDBMS
Answer» RIGHT answer is (c) It ensures that all tuples have a finite value on a specified ATTRIBUTE Explanation: The notnull integrity constraint ensures that all the tuples have a finite value on the specified attribute in the RELATION. It AVOIDS the specification of null values.

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