In the space provided below, draw an ER diagram that includes entities for Clients, Contracts, and Contacts. Clients have the following attributes: ClientID (primary key), ClientName, ClientAddress. Contracts have the following attributes: ContractID (primary key), ContractType, LicenseFee. Contacts have the following attributes: ContactID (primary key), ContactName, ContactAddress. Draw a relationship between Clients and Contracts such that a Client can be assigned to many contracts, but it can also exist without having any contracts at all in the database. Conversely, a contract can be assigned to only one client but must be assigned to a client in order to exist. Name your relationship “Signs”. Draw a relationship between Clients and Contacts such that a client must be assigned to one and only one contact. A contact can exist in the database without being assigned to a client, but a contact can be assigned to more than one client. Name your relationship “Has”. Use ER Assistant to draw your diagram. Copy and paste the ERD from ER Assistant into the space provided below. [Note: To receive credit for this problem, you must use ER Assistant as your drawing tool.]
- In the space provided below, draw an ER diagram that includes entities for Clients, Contracts, and Contacts.
Clients have the following attributes: ClientID (primary key), ClientName, ClientAddress.
Contracts have the following attributes: ContractID (primary key), ContractType, LicenseFee.
Contacts have the following attributes: ContactID (primary key), ContactName, ContactAddress.
Draw a relationship between Clients and Contracts such that a Client can be assigned to many contracts, but it can also exist without having any contracts at all in the
Draw a relationship between Clients and Contacts such that a client must be assigned to one and only one contact. A contact can exist in the database without being assigned to a client, but a contact can be assigned to more than one client. Name your relationship “Has”.
Use ER Assistant to draw your diagram. Copy and paste the ERD from ER Assistant into the space provided below. [Note: To receive credit for this problem, you must use ER Assistant as your drawing tool.]
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