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Consider the relations shown in the exhibit. Due to restructuring, the sales department has been eliminated and the employees working in that department have been dismissed. All ID information is stored as integers. Which SQL statement would be used to return a relation with all information for the employees who have been dismissed?

Options:

SELECT *

FROM Employee;

SELECT ID, Last_Name

FROM Employee;

WHERE ID = 0004;

SELECT *

FROM Employee

WHERE Dept_ID = 022;

SELECT *

FROM Employee

WHERE Dept_ID = 022;

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Question 2

Which statement best describes a candidate key?

Options:

It is the primary key for an entity.

It uniquely identifies every instance of an entity.

One or more keys are joined together to form a composite key.

One or more keys may be used to form a primary key.

Question 3

Which three pieces of information did E.F. Codd describe as necessary to retrieve a data value from a relational database?

Options:

Attribute, domain, and tuple

Entity, relation name, and domain

Table name, primary key, and entity

Attribute, relation name, and primary key

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