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Questions and Answers
Which of the following is true about a data model?
Which of the following is true about a data model?
- It only describes the operations for manipulating database structures
- It only specifies constraints for a database
- It only describes the structure of a database
- It describes the structure of a database, the operations for manipulating these structures, and certain constraints that the database should obey (correct)
What are constructs used for in a data model?
What are constructs used for in a data model?
- To define the constraints for a database
- To define the database structure (correct)
- To define the operations for manipulating database structures
- To define the data types for a database
What is the purpose of constraints in a data model?
What is the purpose of constraints in a data model?
- To allow for invalid data to be stored in the database
- To restrict access to the database
- To define the data types for the database
- To specify some restrictions on valid data that must be enforced at all times (correct)
