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SQL for Dummies

7th Edition Notes

Database: A self-describing collection of integrated records
Record: A representation of some physical or conceptual object
Metadata: The data the describes the data's structure within a database; structural data
Integrated Data: Data that includes not only data items but also the relationships among data items
Data Dictionary: Metadata stored in an area of data which describes the tables, columns, indexes, constraints, and other items that make up a database
DBMS: Database management system
DBMS description: A set of programs used to define, administer, and process databases and their associated applications.
SAN: Storage Area Network - storing daa on the Internet
Flat Files: Data files with minimum structure; a collection of data records, one after another, in a specified format
The three database models: Hierarchical, Network, and Relational
Hierarchical Database: These databases arrange their data in a simple hierarchical structure that allows fast access.They suffer from redundancy problems and their structural inflexibility makes database modification difficult.
Network Database: Network databases have minimal redundancy but have structural complexity
Relational Database: These databases store their data in tables that are related to each other.
Enterprise Databases: Databases built according to the hierarchical or network model.
SQL applies only to which database model? Relational databases / Object-relational databases
Relation: A 2D array of rows and columns, containing single-valued entries and no duplicate rows. Each cell in an array can have only one value and no two rows may be identical
View: A subset of a database that an application can process AKA virtual tables
Created by: rawrrrrkitty