oracle 查询某一时间段内每个月的最后一天
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oracle 查询某一时间段内每个月的最后一天，
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SELECT TO_NUMBER(SUBSTR(VC_SGKSRQ,4)) YEAR,TO_NUMBER(SUBSTR(VC_SGKSRQ,6,2)) MONTH,MAX(TO_NUMBER(SUBSTR(VC_SGKSRQ,9,2))) DAY FROM (SELECT SUBSTR(STATSTIME,1,10) VC_SGKSRQ FROM YJ_T_XHJDW_DAYSTATS WHERE CM_STATIONNUMBER = '46537A2FBB684EB1AB93F84338DCEB08' AND DEVICENAME = 'S' AND STATSTIME >= '2017-08-01' AND STATSTIME <= '2017-11-11' AND DWTYPE = 'U') GROUP BY TO_NUMBER(SUBSTR(VC_SGKSRQ,4)),2)) ORDER BY 1,2
