4S/target/classes/mapper/TraceHelmetHistoryRecordMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zhgd.scs.mapper.TraceHelmetHistoryRecordMapper">

    <select id="getTraceHelmetOnLineDayCount" resultType="com.zhgd.scs.domain.vo.NameCountDate">
        select thd.project_id `name`, count(DISTINCT thd.device_code) count
        from trace_helmet_history_record thhr
                 left join trace_helmet_device thd on thhr.device_code = thd.device_code and thd.in_out_state = 1
        where thhr.device_state = 1
          and date(thhr.test_time) = date(#{date})
        group by thd.project_id
    </select>
</mapper>