A laboratory has several chemists who work on one or more projects. Chemists also may use certain kinds of equip- ment on each project. Attributes of CHEMIST include Em- ployee_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 as- signed, and a given project need not be assigned either a chemist or an equipment item. Provide good definitions for all of the relationships in this situation.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Draw ER diagram for the following
upload the diagram ??
A laboratory has several chemists who work on one or
more projects. Chemists also may use certain kinds of equip-
ment on each project. Attributes of CHEMIST include Em-
ployee_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 as-
signed, and a given project need not be assigned either a
chemist or an equipment item. Provide good definitions
for all of the relationships in this situation.
Transcribed Image Text:Draw ER diagram for the following upload the diagram ?? A laboratory has several chemists who work on one or more projects. Chemists also may use certain kinds of equip- ment on each project. Attributes of CHEMIST include Em- ployee_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 as- signed, and a given project need not be assigned either a chemist or an equipment item. Provide good definitions for all of the relationships in this situation.
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