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$collection->printlogquery(true); 
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         $collection=Mage::getResourceModel('reports/product_collection');
$query=$collection->getSelectSql(true);
echo $query; 
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student(
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);
studentInfo(
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age,
address,
foreign key(id) references outTable(id) on delete cascade on update cascade
);
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select a.ClassName,a.CourseName,sum(²»¼°¸ñ) as ²»¼°¸ñ,sum(²î) as ²î,sum(ÖеÈ) as ÖеÈ,sum(ºÃ) as ºÃ ,sum(²»¼°¸ñ)+sum(²î)+sum(ÖеÈ)+sum(ºÃ) as °à¼¶×ÜÈËÊý from (select StudentID,ClassName,CourseName,1 as ²»¼°¸ñ,0 as ²î,0 as ÖеÈ,0 as ºÃ from StudentScore where ScoreRemark='fail' union all
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