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SELECT hp_patient.name, hp_ptorders.DrugName, hp_ptorders.Dosage,hp_ptorders.DosageUnit
FROM hp_patient
LEFT JOIN hp_ptorders
ON hp_patient.pid=hp_ptorders.PtId
ORDER BY hp_patient.name
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原文地址:http://www.cnblogs.com/terminator404/p/5110659.html