SQL for Product Managers
When to Write SQL Yourself vs. When to Ask for Help
Fluency doesn't mean doing everything yourself. It means knowing, correctly and quickly, which of these two lists a given question belongs on.
Write it yourself | Ask for help |
|---|---|
A quick count or filter you need in the next ten minutes | A query touching production systems with real performance risk at scale |
Exploring a hypothesis before committing anyone else's time | Anything that will become a permanent, scheduled, relied-upon dashboard |
Sanity-checking a number someone else gave you | A query joining tables whose relationship you don't yet understand |
A one-off analysis that only you will ever see | Anything where being wrong has real consequences (a board metric, a pricing decision, a compliance report) |
The line isn't about difficulty. It's about permanence and blast radius. A query you run once, read yourself, and discard has almost no downside if it's imperfect, because you're the only consumer and you can sanity-check it yourself. A query that becomes the source of truth for a metric other people will repeat in other rooms deserves another set of eyes, exactly the same way a quick internal script and a production API have very different quality bars, as covered in the companion API course.
YOUR MOVE THIS WEEK
Look at your last five data questions. Sort them honestly into these two columns using the permanence-and-blast-radius test, not a difficulty guess. You'll likely find more in the "write it yourself" column than you expected.