This is why I am greatful I spent my first five years as a DBA: learning SQL was just a tool but why things worked or didn’t work, why queries were fast or slow

This is why I am greatful I spent my first five years as a DBA: learning SQL was just a tool but why things worked or didn’t work, why queries were fast or slow, how to best define a schema for a given use-case (that’s key — schema design should fit the business use-case not some arbitrary “beautiful” theoretical model)