mysql query problem WHERE date < -

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i have following query

select *, count(jx_commissions.commission_amount) summe  jx_members  inner join jx_commissions on jx_commissions.mid = jx_members.mid  jx_commissions.date > '2011-01-01' group jx_commissions.mid  order summe desc  limit 1, 20

field date have date format , dates have right format y-m-d

but if use query not results... if change date nother one, wrong results... think compare string... how can search date??

enter image description here

enter image description here

if jx_commissions.date date field can conditional jx_commissions.date > date('2011-01-01')


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