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运用分组的SQL语句中,如何知道分成的组的数目?
如下SQL:select zd1,zd2,sum(zd3) from table1 where (条件)
group by zd1,zd2;
如下SQL:select zd1,zd2,sum(zd3) from table1 where (条件)
group by zd1,zd2;