Oracle去重查询

distinct的用法
1.distinct+单个字段，表示对该字段进行去重
2.distinct+column1+column2 表示的是使用多个字段进行联合去重

方法一：GROUP BY分组去重

SELECT T.DOCTOR_ID AS FDOCTORCODE,max(T.DOCTOR_NAME) AS FDOCTORNAME,max(T.DOCTOR_PHONE) AS FDOCTORPHONE,max(T.ORG_ID) AS FORGID,max(T.DEPENT_ID) AS FDEPTCODEFROM CONSULT_SCHEDULE T
WHERE ORG_ID = '134557'AND DEPENT_ID = '1004'
GROUP BY DOCTOR_ID

方法二：

SELECT T.DOCTOR_ID    AS FDOCTORCODE,T.DOCTOR_NAME  AS FDOCTORNAME,T.DOCTOR_PHONE AS FDOCTORPHONE,T.ORG_ID       AS FORGID,T.DEPENT_ID    AS FDEPTCODEFROM CONSULT_SCHEDULE T,(SELECT MAX(ROWID) ROWID2FROM CONSULT_SCHEDULEWHERE ORG_ID = '416211338'AND DEPENT_ID = '1004'GROUP BY DOCTOR_ID) T2WHERE T.ROWID = T2.ROWID2

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