Ultimate Guide to PostgreSQL Constraints

From the article: "engineers mistook acceleration readings measured in English units of pound-seconds for a metric measure of force called newton-seconds."

Yikes. Acceleration is change in velocity per unit time, and would be measured in feet/second^2 or meters/second^2. Both pound seconds and newton seconds are measures of momentum (mass times velocity). He then goes on to define a custom domain called "acceleration" but gives it units of "1 m*kg/s".

Seems to know his stuff when it comes to PostgreSQL, but evidently it's been too long since he took a high school physics class.

Article title: "PostgreSQL Domain Integrity In Depth"