An ER diagram shows the relationship among entity sets. An entity set is a group of similar entities and these entities can have attributes. In terms of DBMS, an entity is a table or attribute of a table in database, so by showing relationship among tables and their attributes, ER diagram...
In relational databases, a one-to-many relationship occurs when a parent record in one table can potentially reference several child records in another table. In a one-to-many relationship, the parent is not required to have child records; therefore, the one-to-many relationship allows zero ch...
Nevertheless, the understanding and use of all the constructs and constraints which are presented in such models are not an easy task and sometimes it is cause of loss of interest.In this chapter we have tried to study in depth and clarify the meaning of the features of conceptual models. ...
A many-to-many relationship refers to a relationship between tables in a database when a parent row in one table contains several child rows in the second table, and vice versa. Many-to-many relationships are often tricky to represent. Advertisements The many-to-many relationship is usually...
ANSWER: Each build on the previous.Dataare raw facts, whileinformationis data that has meaning.Business intelligenceis collective information that gives you the ability to make strategic business decisions. Finally,knowledgeis a broad term that can encompass BI context, how to affect BI, patents an...