28 lines
761 B
XML
28 lines
761 B
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="cn.unizk.mapper.DeviceUsageDetailMapper">
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<select id="selectTopThree" resultType="cn.unizk.entity.po.DeviceUsageDetail">
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SELECT pl,create_time
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FROM device_usage_detail
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WHERE pl IN (
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SELECT t.pl
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FROM (
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-- 核心逻辑放在这里，作为一张虚拟表
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SELECT pl
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FROM device_usage_detail
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WHERE usage_record_id = #{usageRecordId}
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and status = 2
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GROUP BY pl
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ORDER BY COUNT(*) DESC
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LIMIT 3
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) AS t -- 必须给派生表起别名
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)
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and usage_record_id = #{usageRecordId}
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</select>
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</mapper>
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