David wants to make improvements to the management of his company inventory and will like to start by developing a set of tables to store the following data about purchases of inventory: product number date of purchase supplier number supplier address supplier same unit price quantity purchased employee number employee name purchase order number product description quantity on hand total amount of purchase (a) Design a set of relational tables to store this data. (b) Identify the primary key for each table. (c) Identify the foreign keys needed in the tables to implement referential integrity.

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A: Answer is

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A: Relational model of this schema is below picture

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Q: 3: Mapping the ER diagram into a relational model.

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A: Answer:

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Fundamentals of Datawarehouse

A data warehouse is a data repository which is used to store large quantities of historical data that are mostly used for creating reports that help businesses to identify their weaknesses and strengths. For example, demographics data about people of a region can help businesses identify the needs and preferences of the region’s population. A data warehouse acts as a central storage for storing data that comes from one or more heterogenous sources. It also consists of data which can be old and of historical value. One of the most important applications of this type of system is that it is used for supporting business intelligence and data analytics applications.