23 lines
693 B
SQL
23 lines
693 B
SQL
-- 从 air_conditioner_crash_log 表中获取指定 id 损坏的次数以及损坏次数的排名
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SELECT crash_count, crash_rank
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FROM (
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SELECT id,
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COUNT(*) AS crash_count,
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RANK() OVER (ORDER BY COUNT(*) DESC) AS crash_rank
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FROM air_conditioner_crash_log
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GROUP BY id
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) AS ranked_data
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WHERE id = ?
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-- 如果该 id 没有损坏记录，则返回 0 次损坏和对应的最后一名
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UNION
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SELECT 0 AS crash_count,
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(SELECT COUNT(DISTINCT id) + 1 FROM air_conditioner_crash_log) AS crash_rank
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FROM (
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SELECT DISTINCT id
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FROM air_conditioner_crash_log
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) AS ranked_data
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WHERE NOT EXISTS (
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SELECT 1
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FROM air_conditioner_crash_log
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WHERE id = ?
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); |