The SELECT Statement Explained (Zero to Pro)

You write SELECT first — but it's almost the last thing the database actually runs. This video breaks down the SELECT statement clause by clause, then reveals the part most tutorials skip: the logical order of evaluation, and why it's completely different from the order you type. We cover the anatomy of a SELECT query (SELECT, FROM, WHERE, GROUP BY, HAVING, ORDER BY, LIMIT), the real evaluation pipeline (FROM & JOIN → WHERE → GROUP BY → HAVING → SELECT → DISTINCT → ORDER BY → LIMIT), why WHERE can't filter on aggregates like COUNT or SUM, why HAVING can, why a SELECT alias works in ORDER BY but fails in WHERE, and why LIMIT never skips the work that happens before it. TIMESTAMPS 0:00 Intro — The SELECT Statement, Explained 0:15 The Anatomy — Seven Clauses, One Query 0:37 The Catch — Written Order ≠ Evaluation Order 0:54 Step 1: FROM & JOIN — Build the Working Row Set 1:16 Step 2: WHERE — Filter Rows, One at a Time 1:40 Step 3: GROUP BY — Bucket Rows Into Groups 1:56 Step 4: HAVING — Filter the Groups, Not the Rows 2:16 Step 5: SELECT — Project the Final Columns (+ DISTINCT) 2:48 Step 6: ORDER BY — Sort the Final Result 3:03 Step 7: LIMIT — Trim the Final Output 3:22 The Real Order — Full Recap If this finally made the SELECT statement click, consider subscribing for more deep dives like this.