1.3.2 Databases - Atharwa Flashcards
What is an Entity?
An item, object or thing a database is about
What is a flat-file database?
A database where data is all stored on one large table
What is a relational database?
Data stored in separate tables linked with foreign keys
What is a Primary key?
A field which can be used to uniquely identify a record
Name ways of collecting data
Webforms, Barcodes, QR codes, Written forms with optical character recognition, Magnetic ink/ stripes
What are the requirements of 1NF?
Must have a primary key, data must be atomic, no repeating attributes, each field must a unique.
What are the requirements of 2NF?
Must be in 1NF, no partial dependencies.
What are the requirements of 3NF?
Must be in 2NF, no transitive dependencies.
What is a partial dependency?
When a field only depends on a part of a composite key, not all of it.
What is a transitive dependency?
When a field depends on another field that isn’t a primary/composite key
What is Atomicity?
What is Consistency?
What is Isolation?
What is Durability?
What is Data Integrity?
