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# SQL Data model

The data model presented in this section pertains only to the structure of AequilibraE’s project_database and general information about the usefulness of specific fields, especially on the interdependency between tables.

## Conventions

A few conventions have been adopted in the definition of the data model and some are listed below:

- Geometry field is always called geometry

- Projection is 4326 (WGS84)

- Tables are all in all lower case

## Project tables

- about table structure
- attributes documentation table structure
- link types table structure
- links table structure
- matrices table structure
- modes table structure
- nodes table structure
- periods table structure
- results table structure
- transit graph configs table structure
- zones table structure