update tChnAssSetGroupGrade c set c.assposition = (select d.rank from ( select b.group_id,b.sorce,b.assposition,rownum rank from (select a.group_id,a.sorce,a.assposition from tChnAssSetGroupGrade a order by a.sorce desc)b )d where d.group_id=c.group_id);
oracle sort a very useful thing
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Origin blog.csdn.net/jifeijixufly/article/details/4938887
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Ranking