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Krzysztof kuhy Rudnicki
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Docker mysql:8.0.33 container, judge-style output grading, 12 original drills with live-verified references kept in tests only. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WzxdWZewj4WS5X6AZyjWDp
515 B
515 B
CONCAT and percentage formatting
poll_votes has the vote count per option for several polls. For each
option print its share of its own poll's votes with one decimal.
Output columns (no header): poll_id, then text like Red: 42.9%.
- Order by
poll_id, then votes descending, then option name ascending. - A share of exactly 50 prints
50.0%and zero prints0.0%. - Trap:
ROUND(x, 1)keeps the trailing.0only on a DECIMAL, so do the arithmetic in decimal, not by dividing integers withDIV.