SQL语句就可以做了,例检索表格aaa,添加一列“re_num”,显示a列值重复的次数，
次数为表格按a列分组计算记录数：
select a,count(a) as 're_num' from aaa group by a，
select a1.*,a2.re_num from
aaa a1
join
(select a,count(a) as 're_num' from aaa group by a) a2
on a1.a = a2.a;
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