Data modelling - Document
Data model
A structured description of what data is kept and how its different parts relate
What's it for?
Creates a shared picture of what information exists and how the different pieces relate to one another.
For example…
Sales and finance agree exactly what 'order date' means.
A data model shows that one customer can have many orders and each order can contain several products, with clear keys linking them
Think of it like…
Designing a supermarket layout: deciding what aisles and shelves there will be and how they’re organised before any stock is added