SQL Foundations #8: NULL Logic and the Trap That Catches Everyone

Day 8 of SQL Foundations Reframed. Today: three-valued logic, the silent dropout in WHERE clauses, COALESCE and NULLIF cleanup patterns, and how aggregates handle NULL. — 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 (you are here) #9 Reading EXPLAIN (Performance Intuition) #10 Validation in SQL (Capstone) 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.