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ORDER BY a.id DESC,a.parent_id DESC
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ORDER BY a.id DESC,a.parent_id DESC
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SELECT CONCAT(b.pigpen_name,a.pigpen_name) room,a.id unit_id,df.id1_value 'tem',df.id2_value 'hum'
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SELECT CONCAT(b.pigpen_name,a.pigpen_name) room,a.id unit_id,df.id1_value 'tem',df.id2_value 'hum'
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