Question: How many of the following statements are true? 1)It is possible to have two candidate keys with different numbers of attributes. 2) A composite key has more than 1 attribute. 3) The computer picks the primary key used in the design. 4) A relationship has a primary key. 5) An attribute has a primary key. A) 0 B) 1 C) 2 D) 3 E) 4

Question: How many of the following statements are true? 1) Attributes are properties of either entities or relationships. 2) An attribute may be multi-valued. 3) A composite attribute contains two or more components. 4) Each attribute has a domain representing its data type. 5) A derived attribute is physically stored in the database. A) 0 B) 1 C) 2 D) 3 E) 4

Which of the following statements is true?Group of answer choicesEvery super key is a candidate key.An alternate key is a super key with redundant attributes.A composite key cannot be a primary keyEvery candidate key is a super key.

Which of the following statements is FALSE about keys in a relationaldatabase?a. Any candidate key is eligible to become a primary key.b. A primary key uniquely identifies the tuples in a relation.c. A candidate key that is not a primary key is a foreign key.d. A foreign key is an attribute whose value is derived from the primarykey of another relation

A composite key is used when _____________*1 pointmore than one key is needed to identify a recordit is difficult to identify a primary keymore than two keys are needed to identify a recordit is difficult to identify a secondary key

Which of the statement(S) are incorrect w.r.t primary key in SQL. A. A primary key can contain duplicate values to ensure redundancy.B. A primary key can be a composite key, consisting of multiple columns.C. A primary key must be an auto-increment field.D. A primary key cannot be null