ERD conditions: Read Need to know the date and content of the reading. i. The storage of previous water meter readings is poorly designed because it contains redundant data that can be found in existing data ii. Consumption should not be a calculable attribute. In the ERD I showed, WaterConsumption is used as FK, PK is in READING, and the title requirement cannot be an attribute. I don't know how to solve this problem. Can Waterconsumption be calculated without being an attribute?   Note: The Meter_reader entity and the Water_Meter entity are many-to-many relationships, and Reading is an associated entity. The other connections are correct

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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.