group by rollup函数的用法

有个表a有字段c1,c2有记录2015-03-01 22015-03-01 32015-03-02 5想要获得获得以下结果2015-03-01 42015-03-02 5合计 9能够经过 select decode(grouping(c1),1,'合计',c1),sum(c2) from a group by rollup(c1)]便可获得,roll

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