Databases for chess games

Question

A previous question wanted to save each move to a database as a game of chess plays out. And asked what database to use to do this. Various possibilities were given:

MongoDb, CouchDb, MySql, SQLite

One answer in particular mentioned a traditional one to many mapping:

The only advantage I can see to a mongodb or couchdb is that you could conceivably store the entire match in a single record, thus making your data a little simpler. You wouldn't have to do the traditional one to many mapping between moves table and a game table.

What exactly does this mean and what would this look like in say PostgreSql so I have a concrete idea of what this means?

Answer 1

Below example Entity Relationship Diagram based on SQL 2005, but with some tweaks to datatypes it can be transferred to MySql or PostgreSql.