What is a database

an integrated collection of data
implicit properties
- represents some aspect of th real world, called miniworld
- is a coherent collection of data with inherent meaning
- is designed built and populated with data for a specific purpose

DBMS

a software system designed to store, manage, and facilitate access to the database
Oracle, SQL erver, MySQL, MonogDB

Application program

a program that provides access to the dtabase by sending queries and requests for data to the DBMS

This course

modelling and design of DBs
programming (SQL + appliation development)
DBMS implementation

specifiically relational databases

ER modelling
datbase normalisation
SQL

relational vs nosql

relation is better for structured data, nosql is better for abstract data, as it is more flexible

Data modelling

first step in designing database

create a data model for a specific problem domain

a model is Defn: a collection of concepts that can be used to describe the structure of a database such as data types, relationsips, and contraints that should hold for the data

schema Defn: a collection of metadata that describes the logical view of a database

noSQL databases are either schema-free or have relaxed schemas

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