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分享insert into od(a,b,c,d,e,f)
select a,b,c,d,e,left(a,3) from ob order by e insert into od(a,b,c,d,e,f)
select distinct a,b,c,d,e,mid(a,3,1) from ob where e=date() order by e insert into od(a,b,c,d,e,f)
select a,b,c,d,e,left(a,3) from ob where e=date() order by e