Question

Indicate against each of the following statements, True or False :
(a) Every relation has at least one super key by default, which is the combination
of all its attributes.
(b) Data transformation is called Information.
(c) Referential integrity constraint arises because of relationships between various
entities.
(d) The complete absence of WHERE clause in SELECT statement implies that
no tuples of a relation shall be selected.
(e) ER model is an example of representational data model.

Answer 1

Answer:

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Answer 2

Answers:

a. True

   Super key is the combination of all attributes. It is the default key.

b. True

   Information is a data that have been processed  and refined

c. True

   Referential integrity constraint associates two entity types.

d. False

   Absence of WHERE clause in SELECT  statement implies that the tuples from a relation are to be selected without  applying any condition.

e.  False

    It is a conceptual data model, which is mostly used in database-oriented  applications.