使用空值選擇具有值的列

Question

我有一個查詢來選擇不具有空值的列，但它不起作用..請告訴我問題出在哪里。 謝謝

$query= mysql_query("SELECT opt_one, opt_two, opt_three, opt_four, opt_five, opt_six FROM `table`
        WHERE `opt_one` IS NOT NULL AND `opt_two` IS NOT NULL AND `opt_three` IS NOT NULL AND
        `opt_four` IS NOT NULL AND `opt_five` IS NOT NULL AND `opt_six` IS NOT NULL AND  q_id = '$id'")or die(mysql_error);
while($r3 = mysql_fetch_array($query))
{
   $print = array($r3['opt_one'], $r3['opt_two'], 
   $r3['opt_three'],          
   $r3['opt_four'], $r3['opt_five'], $r3['opt_six']);
   shuffle($print);

   echo $print['0'];
   echo '<br>';
   echo $print['1'];
   echo '<br>';
   echo $print['2'];
   echo '<br>';
   echo $print['3'];
   echo '<br>';
   echo $print['4'];
   echo '<br>';
   echo $print['5'];
   echo '<br>';

}

Answer 1

我認為您在列中具有空值而不是NULL 。 嘗試這個：

SELECT opt_one, opt_two, opt_three, opt_four, opt_five, opt_six 
FROM `table`
WHERE (`opt_one` IS NOT NULL OR `opt_one` != '') 
AND (`opt_two` IS NOT NULL OR `opt_two` != '') 
AND (`opt_three` IS NOT NULL OR `opt_three` != '')
AND (`opt_four` IS NOT NULL OR `opt_four` != '') 
AND (`opt_five` IS NOT NULL OR `opt_five` != '')
AND (`opt_six` IS NOT NULL OR `opt_six` != '')
AND  q_id = '$id'

邊注：

停止使用已棄用的mysql_ *擴展名，並在PHP 7中關閉，使用mysqli_ *或PDO 。