Normalization

In our Invisible City, as the population grows and the subway map expands, Conductor Mickey sometimes finds that a simple Star Hub isn’t enough. When the “Station” information becomes a giant, messy pile of repeating words, it’s time to move to the Snowflake Schema. If the Star Schema is the “Express Line,” the Snowflake is the “Highly Detailed District.” What is a Snowflake Schema? In the previous post, we saw how the Star Schema keeps things simple. But what happens when your data starts repeating itself? What if you have 10 million rows, and you’ve written “United States” and “North America” 10 million times? ...