Question

我现有的SQL查询：

$getEdu = "SELECT * FROM Request_Subject WHERE REQUEST_ID = $id
                                         AND SUBJECT_ID IN (2,3,4)";

因此，在我的数据库中，每个REQUEST_ID都可以与多个SUBJECT_IDs

相关联

SUBJECT_ID的值范围为1 to 10。

所以我在表中的现有值是：

REQUEST_ID: 1 -> SUBJECT_IDs: 2,3
REQUEST_ID: 2 -> SUBJECT_IDs: 2,4
REQUEST_ID: 3 -> SUBJECT_IDs: 2,8

因此，当查询运行时，REQUEST_ID = 3仍将包含在结果中，因为它具有SUBJECT_ID = 2。

我是否有可能创建SQL查询，即使一个值匹配，查询也会忽略REQUEST_ID，因为它与数组的值不同。

提前谢谢。

更新

当前结果：

    $requestSubjects = array();

    // So if I call REQUEST_ID = 3
    $getEdu = "SELECT * FROM Request_Subject WHERE REQUEST_ID = 3
                                             AND SUBJECT_ID IN (2,3,4)";

    $getEdu_answer = mysqli_query($connection, $getEdu);

    if(!$getEdu_answer || mysqli_num_rows($getEdu_answer)==0) {
      echo "Error";
      die();
    }

    else {
      while($subjectRow = mysqli_fetch_assoc($getEdu_answer)) {
        $subject = $subjectRow["Subject_ID"];

        array_push($requestSubjects, $subject);    
      }

      $reqSub = '{"reqSubject":' .json_encode($requestSubjects). '}';
      echo $reqSub; // Returning a JSON to ajax
    }

回应结果：

{"reqSubject":[2]}

结果是正确的，因为REQUEST_ID=3与SUBJECT_ID = 2相关联。

但我想要的是，由于REQUEST_ID=3也与SUBJECT_ID = 8相关联，因此根本不会回显结果。

Answer 1

如果我理解正确，你有REQUEST_ID的所有SUBJECT_IDS匹配（2,3,4）然后才能打印结果？如果是这样，您可以为每个SUBJECT_ID构建查询

编辑：

您必须使用其他sqlquery获取所有 REJEST_ID的SUBJECT_ID
将SUBJECT_ID与您的$ getEdu查询联系，然后才执行$ getEdu查询

示例：

$getEdu = "SELECT * FROM Request_Subject WHERE REQUEST_ID = $id";
    //$sub_list is the all subect_id of $id
    foreach ($sub_list as $sub_id){
        $getEdu.=" AND $sub_id IN (2,3,4)";
    }
    $getEdu_answer = mysqli_query($connection, $getEdu);

如果你在你的例子上执行它，REQUEST_ID = 3，比$ qetEdu查询应该是：

SELECT * FROM Request_Subject WHERE REQUEST_ID = 3 AND 2 IN (2,3,4) AND 8 IN (2,3,4)

意味着REQUEST_ID = 3不会返回，因为8不在（2,3,4）

希望它有所帮助。

Answer 2

也许

$getEdu = "SELECT * FROM Request_Subject WHERE REQUEST_ID=3
                                             AND SUBJECT_ID IN (2,3,4, if(REQUEST_ID=3,8,null))";

如果我理解正确的话......

SQL查询检查列中的列值是否为数组

2 个答案: