Add lesson 34: Functions#94
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Part of #6 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Adds Functions (roadmap item
02-functions) — the new Module 8: Programmability.Summary
Store reusable logic in the database with CREATE FUNCTION — SQL vs PL/pgSQL, return shapes, and volatility.
Check
One
query-returnscheck (net-to-gross-works) — the learner writes a function and the check calls it and compares the exact numeric result.Verified end-to-end against a non-superuser Postgres 16.
npm run lessons:validate(34/34) andnext buildboth pass.Part of #6
🤖 Generated with Claude Code