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...
The entity class names have been changed in an attempt to bring the language of the object-oriented and entity-relationship worlds together. This has been done without loss of meaning. A “type” of entity can as easily be called a “class” of entity, and each end of a relationship does...
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...
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...
There is a circle over the crow’s feet, meaning it is optional. On the parent side, a single line indicates a “one” relationship, so it is one-to-many (one from the parent, many for the children). The circle indicates that it is optional. There are optional relationships on both...
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...