An organization undertakes manufacturing projects. There are different kinds of employees (full time and part time). Each employee can move on one or more projects. Each project is undertaken on the request of a client. A client can be a public sector company or a private sector company. A project can use a number of items from a different manufacturers and an item may be used by several projects. Clearly indicate the entities, attributes, relationship between entities, keys and cardinalities and make suitable assumptions. (a) Draw the EER (extended ER) diagram for the above organization showing all entities , relationship, aggregation, generalization /specialization and convert it into relational schemas (b) Draw the appropriate tables and relationship among the tables for the above diagram and normalize the tables up to 3NF (c) Identify weak entity sets in the above diagram if any. How will you convert a weak entity set to a strong entity set? Illustrate. (d) Identify multivalued dependency in the above diagram. (e) Using the manufacturing example, write relational – algebra expressions to do the the following queries: • Find out how many employees working on P1 and P2 projects • How many projects are using items I1 and I2.
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(a) Draw the EER (extended ER) diagram for the above organization
showing all entities , relationship, aggregation, generalization
/specialization and convert it into relational schemas
(b) Draw the appropriate tables and relationship among the tables for
the above diagram and normalize the tables up to 3NF
(c) Identify weak entity sets in the above diagram if any. How will
you convert a weak entity set to a strong entity set? Illustrate.
(d) Identify multivalued dependency in the above diagram.
(e) Using the manufacturing example, write relational – algebra
expressions to do the the following queries:
• Find out how many employees working on P1 and P2 projects
• How many projects are using items I1 and I2.
showing all entities , relationship, aggregation, generalization
/specialization and convert it into relational schemas
(b) Draw the appropriate tables and relationship among the tables for
the above diagram and normalize the tables up to 3NF
(c) Identify weak entity sets in the above diagram if any. How will
you convert a weak entity set to a strong entity set? Illustrate.
(d) Identify multivalued dependency in the above diagram.
(e) Using the manufacturing example, write relational – algebra
expressions to do the the following queries:
• Find out how many employees working on P1 and P2 projects
• How many projects are using items I1 and I2.
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