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tp查詢中2個表格中欄位,比較大小

$page = I('page');    // 第幾頁
$cond['_string'] = 'c.warning_amount > i.remaining_amount';
$earlyWarnList = $commodity
    ->alias('c')
    ->join('__T_SPECIFICATION__ spec ON spec.id=c.commodity_specification_id')
    ->join('__T_COMMODITY__ type ON type.id=c.commodity_classification_id')
    ->join('__INVENTORY__ i ON i.commodity_id=c.id')
    ->field('c.commodity_name,spec.commodity_specification_name,c.warning_amount,i.remaining_amount')


    ->where($cond)
    ->order('c.id desc')
    ->page($page, C('LIMIT_N'))
    ->select();