mysql - SQL still got duplicate rows after add DISTINCT -

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here sql include 3 tables,trans,sys_org , sys_pay.select through mid (but not unique)

i tried 

select distinct trans.mid,trans.a,sys_org.b,sys_org.c,sys_pay.d      sys_org       left join trans on sys_org.mid = trans.mid      left join sys_pay on sys_org.mid = sys_pay.mid

and returns duplicate rows,how fix it?

return this:

trans.mid  trans.a  sys_org.b  sys_org.c  sys_pay.d 1111       aaa      bbb        ccc        ddd 1111       aaa      bbb        ccc        ddd

i sure rows distinct here distinct means whole row not specific column.

if not create sqlfiddle can check it.

further if want fetch unique value based on specific field should use group by.


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