12 Questions
In the relational model, what are the data elements in each row called?
Tuples
What is the key of a relation in the context of a table?
Value that uniquely identifies a row
What is the concept that gives an indication of the meaning of the data items in a column?
Column header or Attribute
What do the data elements in each row of a relational model represent?
Entities
In the context of a table, what is the key that uniquely identifies each row?
Primary Key
What is the formal term for the column header that gives an indication of the meaning of the data items in that column?
Attributes
What are sometimes assigned as keys to identify the rows in a table, besides the actual data values?
Row-ids or sequential numbers
In the context of a table, what is sometimes assigned as keys to identify the rows and is called an artificial key or surrogate key?
Primary Key
What does EER stand for in the context of database modeling?
Enhanced Entity-Relationship
What are some of the additional concepts included in the EER model?
Subclasses/superclasses
How does EER extend ER diagrams to represent additional subgroupings of entities?
By using subclasses or subtypes
What are some fundamental concepts used in conceptual modeling with the EER model?
Categories (UNION types)
Test your knowledge of the relational data model, constraints, database schemas, and update operations with this quiz based on the concepts presented in Ramez Elmasri and Shamkant B. Navathe's lecture slides.
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