select ID,NAME,REPORT_ID
from
(
select *, @row:=if(name=@name,@row,0)+1 as rn, @name:=name from
(select *,RAND() as trand from t) t1,
(select @row:=0,@name:='') tm2
order by name,trand
) t2
where rn<=10
每个指定的组选择n个随机行
每个指定的组选择n个随机行
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