DATAWAREHOUSING.md

It is rare that your applications database will have all the data you need and be structured in a way that lets you ask all of the questions you are interested in. Typically an application database will have a schema optimized for small reads and updates, while most analytics queries typically touch a large fraction of a table. 

# Ingestion
## From other databases

If you database is small enough, then it is generally easy enough to dump the whole database and then ingest it into your datawarehouse. 

### Postgres
### MySQL
### Heroku

## Events
## Third party data

# Transformation
## Uniques
## Event Enrichment
## Denormalization
## Working backwards from Metrics Example