Draw an ER diagram using proper notations based on the following business rules. • Please identify the entities and relationships between them . • For each entity, please identify the attributes each entity has. • For each attribute, please identify whether this attribute is optional or required, single valued or multi-valued, simple or composite, stored or derived . • Define a key (identifier) for each entity. Note that a key can contain multiple attributes (composite key). A laboratory has several chemists who work on one or more projects. Chemists also may use certain kinds of equipment on each project. Attributes of CHEMIST include Employee ID (identifier), Name, and Phone No. Attributes of PROJECT include Project ID (identifier) and Start Date. Attributes of EQUIPMENT include Serial No and Cost. The organization wishes to record Assign Date—that is, the date when a given equipment item was assigned to a particular chemist working on a specified project. A chemist must be assigned to at least one project and one equipment item. A given equipment item need not be assigned, and a given project need not be assigned either a chemist or an equipment item. 2. A bank has three types of accounts: checking, savings and loan. The following are the attributes for each type of account: Checking: acct_no, date_opened, balance, service_charge Savings: acct_no, date_opened, balance, interest_rate Loan: acct_no, date_opened, balance, interest_rate, payment Assume each bank account must be a member of exactly one of these subtypes. Using generalization, develop an EER model to represent this situation. Please draw an EER diagram using proper notations.
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1. Draw an ER diagram using proper notations based on the following business rules.
• Please identify the entities and relationships between them
. • For each entity, please identify the attributes each entity has.
• For each attribute, please identify whether this attribute is optional or required, single valued or multi-valued, simple or composite, stored or derived
. • Define a key (identifier) for each entity. Note that a key can contain multiple attributes (composite key).
A laboratory has several chemists who work on one or more projects. Chemists also may use certain kinds of equipment on each project. Attributes of CHEMIST include Employee ID (identifier), Name, and Phone No. Attributes of PROJECT include Project ID (identifier) and Start Date. Attributes of EQUIPMENT include Serial No and Cost. The organization wishes to record Assign Date—that is, the date when a given equipment item was assigned to a particular chemist working on a specified project. A chemist must be assigned to at least one project and one equipment item. A given equipment item need not be assigned, and a given project need not be assigned either a chemist or an equipment item.
2. A bank has three types of accounts: checking, savings and loan. The following are the attributes for each type of account: Checking: acct_no, date_opened, balance, service_charge Savings: acct_no, date_opened, balance, interest_rate Loan: acct_no, date_opened, balance, interest_rate, payment Assume each bank account must be a member of exactly one of these subtypes. Using generalization, develop an EER model to represent this situation. Please draw an EER diagram using proper notations.
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