Database | Introducing Entities
In this tutorial, we discuss database design concept Entities.
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Out of all the tech subjects I have lectured on, databases or relational database systems have always been a subject with a "steep learning curve". Students tend to find it challenging, and learning takes much more effort than other subjects.
This course aims to help support anyone starting their journey into relational database systems by establishing underpinning skills and concepts of database and database design by working through practical scenario reasoning and providing the rationale to design decisions. Nothing beats experience in most subjects. That is amplified in the realms of relational database development. With the knowledge and experience gained in the course in hand, I hope that on completion of this course, it will provide the scaffolding, underpinning knowledge to support your endeavours in the world of relational database development.
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I think that an important question to ask when identifying entities is to determine if the thing/object exists in its own right. Example: Does an “order line” exist independently of an “order”? Probably not although if there is some process that use “order line” completely independent of order you could argue that “order line” is an entity. For this to be the case any reference to “order” in “order line” can be removed without breaking the logic in the process where “order line” is used.
So an entity, object is a table and attributes of an entity are the fields aka columns?