Add lesson 18: Conditional expressions#58
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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Opens Module 5 (Intermediate querying) with a lesson on conditional expressions: searched and simple
CASE(bucketing, custom sort orders, NULL behavior with noELSE), pivot-style conditional aggregation withcount(*) FILTER/sum(CASE …),COALESCEfallback chains (display defaults, ORDER BY, join conditions), thevalue / NULLIF(divisor, 0)divide-by-zero guard, and a brief look atGREATEST/LEAST.The seed is a small help-desk
ticketstable (8 rows) deliberately full of NULLs — unassigned tickets, missing contact info, unrated satisfaction, and one ticket with zero agent replies to make the NULLIF guard meaningful. SELECT-only lesson, so no checks per CONTRIBUTING.md.Note: this PR bootstraps the shared
lessons/05-intermediate-querying/module.yaml, which the sibling CTE and window-function PRs create with identical content so they merge cleanly.Part of #6
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