42 lines
1.2 KiB
MySQL
42 lines
1.2 KiB
MySQL
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-- list_exercises mit skill_min_level / skill_max_level: EXISTS auf exercise_skills mit numerischem Stufen-Rang.
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-- Ausdruck muss mit backend/routers/exercises.py _EXERCISE_SKILL_LEVEL_RANK_SQL (Alias „es“) übereinstimmen.
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CREATE INDEX IF NOT EXISTS idx_exercise_skills_exercise_level_rank
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ON exercise_skills (
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exercise_id,
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(CASE COALESCE(
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NULLIF(TRIM(LOWER(target_level::text)), ''),
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NULLIF(TRIM(LOWER(required_level::text)), '')
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)
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WHEN 'basis' THEN 1
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WHEN 'grundlagen' THEN 2
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WHEN 'aufbau' THEN 3
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WHEN 'fortgeschritten' THEN 4
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WHEN 'optimierung' THEN 5
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WHEN 'einsteiger' THEN 1
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WHEN 'experte' THEN 5
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WHEN '1' THEN 1
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WHEN '2' THEN 2
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WHEN '3' THEN 3
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WHEN '4' THEN 4
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WHEN '5' THEN 5
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ELSE NULL END)
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)
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WHERE (CASE COALESCE(
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NULLIF(TRIM(LOWER(target_level::text)), ''),
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NULLIF(TRIM(LOWER(required_level::text)), '')
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)
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WHEN 'basis' THEN 1
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WHEN 'grundlagen' THEN 2
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WHEN 'aufbau' THEN 3
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WHEN 'fortgeschritten' THEN 4
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WHEN 'optimierung' THEN 5
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WHEN 'einsteiger' THEN 1
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WHEN 'experte' THEN 5
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WHEN '1' THEN 1
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WHEN '2' THEN 2
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WHEN '3' THEN 3
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WHEN '4' THEN 4
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WHEN '5' THEN 5
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ELSE NULL END) IS NOT NULL;
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