1. Please answer the following questions. You need to draw ER diagrams using any free tools discussed in the class or you may draw using pencil and paper. 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. A company has a number of employees. The attributes of EMPLOYEE include Employee ID (identifier). Name, Address, and Birthdate. The company also has several projects. Attributes of PROJECT include Project ID identifier), Project Name, and Start Date. Each employee may be assigned to one or more projects or may not be assigned to a project. A project must have at least one employee assigned and may have any number of employees assigned. An employee's billing rate may vary by project, and the company wishes to record the applicable billing rate (Billing Rate) for each employee when assigned to a particular project. b. 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 Datethat is, the date when 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. Given equipment item need not be assigned, and a given project need not be assigned either a chemist or an equipment item. 1. Please answer the following questions. You need to draw ER diagrams using any free tools discussed in the class or you may draw using pencil and paper. 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. A company has a number of employees. The attributes of EMPLOYEE include Employee ID (identifier). Name, Address, and Birthdate. The company also has several projects. Attributes of PROJECT include Project ID identifier), Project Name, and Start Date. Each employee may be assigned to one or more projects or may not be assigned to a project. A project must have at least one employee assigned and may have any number of employees assigned. An employee's billing rate may vary by project, and the company wishes to record the applicable billing rate (Billing Rate) for each employee when assigned to a particular project. b. 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 Datethat is, the date when 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. Given equipment item need not be assigned, and a given project need not be assigned either a chemist or an equipment item
