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utils/sql_drills/sql_drills/fixtures/02_pivot_max/DOCS-task.md
Krzysztof kuhy Rudnicki f865508eb4
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Add sql_drills engine package 
Shared MySQL drill engine extracted from testsAndMisc: sandboxed
per-run db and user, exact-match cell diff, predict drills (builtin
theory set incl. an error drill), save_generated validation.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WzxdWYGW5NZL5uVpnqmNKo
2026-11-02 13:53:39 +01:00

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Pivot text attributes with MAX(CASE WHEN)

person_attrs stores one attribute per row (email, phone, city) in a text column. Turn it into one row per person.

Output columns (no header): person, email, phone, city.

  • A missing attribute prints as NULL.
  • Order by person ascending.
  • Hint: SUM cannot pivot text; think about which aggregate can.