Oracle 多表连接查询取最近一条记录

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发布于 2019-11-07 17:32:42

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发布于 2019-11-07 17:32:42

SELECT PCC.CUSTNO custNo,T.PERSON_NO,T.CREATNAME visitorName,to_char(T.VISIT_TIME,'yyyy-MM-dd HH24:mi:ss') visitDate ,T.VISIT_CONTENT vistTxt,PCC.INVNM custName,PCC.BALANCE_TOTAL,PCC.BALANCE_PRODUCT FROM PRSP_CRM_CUSTINFO PCC
		LEFT JOIN
		(SELECT a.*,row_number() over(partition by a.PERSON_NO ORDER BY a.VISIT_TIME DESC) as rn FROM 
		(SELECT 
	       PCV.VISIT_CONTENT,
	       PCV.VISIT_TIME,
	       PPD.INVNM CREATNAME,
		   PCMP.PERSON_NO
        FROM 
			PRSP_CRM_MEETANDACTITY_PERSON PCMP 
		LEFT JOIN 
			PRSP_CRM_VISIT PCV 
		ON 
			PCV.SERIAL_VISIT_NO=PCMP.SERIAL_REFREN_NO 
		LEFT JOIN 
			PRSP_CRM_CUSTINFO PPD 
		ON 
			PPD.CUSTNO=PCV.CREATE_NO
		WHERE PCMP.MEET_TYPE='1' AND PCMP.PERSON_TYPE='2' AND PCMP.DELETE_FLG='0') a ) T
		ON PCC.CUSTNO=T.PERSON_NO and t.rn=1
		where 1=1

1.首先写一个连接查询语句：比如有时间的表排序

2、通过这个函数 select a.* row_number() over(partition by 分组的字段 order by 排序时间 desc) as rn from （结果集） a

2. 显示的结果