MySQL更新错误地更新了多行（显示了失败的“修复”）

Question

我的脚本尝试在$ system_id具有特定值的情况下更新数据库值；问题在于，即使$ system_id的值错误，它也会更新数据库值。

更具体地说：$ g1choice，$ g2choice和$ g3choice将针对$ factor匹配的任何行进行更新，而与$ system_id无关

我在做什么错？谢谢！ ：）

以下：1）代码； 2）尝试修复代码失败

 //Insert & Update Factor A table
    $page_query = $pdo->query(
        "SELECT sum(task_1) AS task01, sum(task_2) AS task02, sum(task_3) AS task03, rand01
        FROM pages
        GROUP BY rand01"
    );

    while ($row = $page_query->fetch()) {

        $factors = $pdo->prepare(
            "SELECT factor
            FROM factorA
            WHERE factor = ? && system_id = ?"
        );
        $factors->execute([$row['rand01'], $system_id]);

        $count = count($factors->fetchAll());

        if ($count > 0) {
            $pdo->prepare(
                "UPDATE factorA
                SET g1choice = ?, g2choice = ?, g3choice = ?
                WHERE factor = ?"
                /* failed fix: WHERE factor = ? &&  system_id = ?" */  
            )->execute([$row['task01'], $row['task02'], $row['task03'], $row['rand01']]);
                /* failed fix:   )->execute([$row['task01'], $row['task02'], $row['task03'], $row['rand01'],$system_id]); */     
        } else {
            $pdo->prepare(
                "INSERT INTO factorA (system_id, factor, g1choice, g2choice, g3choice)
                VALUES (?,?,?,?,?)"
            )->execute([$system_id, $row['rand01'], $row['task01'], $row['task02'], $row['task03']]);
        }
    }

  /*failed fixes below*/

    //failed fix (1):

     failed fix:
     $page_query = $pdo->prepare(
        "SELECT sum(task_1) AS task01, 
         sum(task_2) AS task02, sum(task_3)       
         AS task03, rand01
        FROM pages 
        WHERE system_id= ?
        GROUP BY rand01"
    );
    $factors->execute([$system_id]);        
            */

  //failed fix (2)
/*
               if ($count > 0) {
            $pdo->prepare(
                "UPDATE factorA
                SET g1choice = ?, g2choice = ?, g3choice = ?    

                was WHERE factor = ?"
/* failed fix: WHERE factor = ? &&  system_id = ?" */             

           )->execute([$row['task01'], $row['task02'], $row['task03'], $row['rand01']]);
    /* failed fix:   )->execute([$row['task01'], $row['task02'], $row['task03'], $row['rand01'],$system_id]); */

    */