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Which of the following include guidelines for creating tables in a relational database?

Which of the following include guidelines for creating tables in a relational database?

(a)Only one table in the database needs a primary key
(b)The primary key need not be unique
(c)Attributes may appear in several tables
(d)Data must be atomic.
(e)The secondary key need to be unique.

Dec 29 2017 Read more Less More

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