SQL Foundations #10: Validation in SQL (Series Finale)

Day 10 of SQL Foundations Reframed. The finale. Today: a brief recap of Day 9's EXPLAIN material (Day 9's recording had audio issues and wasn't published), validation as a first-class discipline, the four sanity checks, validation CTEs that fail loudly, the duplicate-phone dedup pattern, and the three durable skills restated on SQL's home turf. — THE FULL SERIES — #1 What SQL Actually Is #2 Reading a Query Without Running It #3 SELECT, WHERE, and the Order That Surprises You #4 Joins, Revisited #5 GROUP BY and the Grain Question #6 Window Functions Without the Fear #7 CTEs and Subqueries (And When Each Wins) #8 NULL Logic and the Trap That Catches Everyone #10 Validation in SQL (Finale) (you are here) Day 9 (Reading EXPLAIN) had a recording issue and wasn't published. The essential material is included in today's intro. If you want the full plan-reading walkthrough, look out for a standalone catch-up episode. Playlist:    • SQL Foundations #1: What SQL Actually Is (...   Dataset (Lagos Logistics CSVs + README): https://drive.google.com/drive/u/2/fo... — ABOUT — Breakfast with Data is a daily one-hour data education program. Python, SQL, Databricks, data governance, and the reasoning skills that make practitioners genuinely good at their work. Hosted by Ola.