SELECT TYEAR, MIN(TDATE) AS STARTDATE, MAX(TDATE), COUNT(TYEAR) AS ENDNUM --TYEAR年,STARTDATE连续记录的开始时间,TDATE连续记录的结束时间,ENDNUM连续的记录树 FROM (SELECT A.*, A.TDATE - ROWNUM AS GNUM --A.TDATE - ROWNUM AS GNUM,将要比较的树减去行号(作用:当A.TDATE排序后再减递增的ROWNUM,如果为连续的记录结果将相同,反之则不是连续的记录) FROM (SELECT * FROM TEST_NUM ORDER BY TYEAR, TDATE) A) --升序排列要比较的数据 GROUP BY TYEAR, GNUM --分组统计连续的记录数 ORDER BY TYEAR, MIN(TDATE)
以上为Oracle实例额,MSSQL请使用ROW_NUMBER()代替ROWNUM