Question: 2.2 In designing a database, what is the entity integrity rule? (a) The primary key in a table should not be null. (b) The foreign

2.2 In designing a database, what is the entity integrity rule?

(a) The primary key in a table should not be null.

(b) The foreign key in a table should not be null.

(c) Each table must have a primary key and a foreign key.

(d) Two of the above are correct.

(e) None of the above is correct.

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