11.Primary key can be duplicated in as many rows of a table as necessary.
12.Each child table must be connected to its parent table through a foreign key.
13.Foreign key in a child table must be defined before the primary key in a parent table.
14.Data type describes the kind of information stored in an attribute.
15.All values in a column must be of the same data type.
16.Primary key from parent table and foreign key from child table do not have to have the same data type.
For years, QuickTax, Inc. has helped small businesses manage their taxes. The management wants a database to keep track of clients, employees, and jobs. Managers need to keep track of client names, addresses, contact persons, phone numbers, and email addresses. They also need to track the employee’s social security numbers, names, and birth dates. Also, the company needs to be able to keep track of the data on each job an employee performs for each of their clients.
For questions 17 – 26, please refer to the preceding paragraph.
17.Employee is an entity that should be included in the database.
18.There are four entities that should be modeled in the ER diagram.
19.There is a one-to-many relationship between employees and clients.
20.There is one-to-many relationship between employees and jobs.
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