篩選數組中的負數sql

Question

function get_patient_balance($pid) { 
    if ($GLOBALS['oer_config']['ws_accounting']['enabled'] === 2) { 
    $brow = sqlQuery("SELECT SUM(fee) AS amount FROM billing WHERE " . 
     "pid = ? AND billed = 1 AND activity = 1", array($pid)); 
    $srow = sqlQuery("SELECT SUM(fee) AS amount FROM drug_sales WHERE " . 
     "pid = ?", array($pid)); 
    $drow = sqlQuery("SELECT SUM(pay_amount) AS payments, " . 
     "SUM(adj_amount) AS adjustments FROM ar_activity WHERE " . 
     "pid = ?", array($pid)); 
    return sprintf('%01.2f', $brow['amount'] + $srow['amount'] 
     - $drow['payments'] - $drow['adjustments']); 
    } 

上面是我正在使用的函數。在這個函數中$ brow從結算表中創建一個數組。在這個數組中有負數。我希望能夠從SUM（費用）AS金額中排除這些數字，以便我只將正數總計加起來。

Answer 1

我希望能夠從SUM（費用）AS金額中排除這些數字，以便我只將正數總計加起來。

所以，你只需要添加所有費用> 0，對不對？我認爲這會做到這一點，如果我得到你的權利：

$brow = sqlQuery("SELECT SUM(fee) AS amount FROM billing WHERE " . 
"pid = ? AND billed = 1 AND activity = 1 and fee > 0", array($pid));