Database software performs three main types of integrity services: semantic,referential, and entity. Which of the following correctly describes one of these services?

i.A semantic integrity mechanism makes sure structural and semantic rules are enforced.
ii. A database has referential integrity if all foreign keys reference existing primary keys.
iii. Entity integrity guarantees that the tuples are uniquely identified by primary key values.

What needs to be put into place to ensure that two users cannot access and modify the same data within a databaase at the same time?

Lance needs to setup a relationship between two tables in the relational database he is working in. Which of the following best describes what does Lance need to create?

Matches between __________ and __________ are important because they represent references from one relation to another.

Which of the following identifies a row within a relational database and is used for indexing?

Which of the following has the advantages of ease of reusing code and reduced maintenance?

What is a pseudo flaw?

The _____________ translates source code one command at a time for execution ona computer.

Which of the following best describes a centralized repository of information about data such as meaning, relationships to other data, origin, usage, and format?

Which of the following statements is true?