Mysql查询可在Phpmyadmin中使用，但不适用于PHP

问题描述

我有两个表第一个是 cont_details

i have two tablesthe first one is cont_details

     -------------- --------------
    | cont_details_id  | cont_no |
     -----------------------------
    |  1                |   A001 |
    |  2                |   A002 |
    |  3                |   A003 |
    ------------------------------

第二个是 cont_sold_tmp

     --------------
    | id | cont_no |
     --------------
    |  1 |   1    |
    |  2 |   3    |
    ----------------

现在我需要从 temp_cont

所以我用了这个查询

select * from cont_details left join cont_sold_tmp on cont_details.cont_details_id = cont_sold_tmp.cont_no where cont_sold_tmp.cont_no is null

当我检入PhpmyAdmin但在HTMl中使用它时，此查询非常有效

This query works perfectly when i check in PhpmyAdmin but when i use it in HTMl, not working

<select name="cont_no"  id="cont_no" data-rel="chosen">
    <option value="">Select</option>
    <?php
       $qry = mysql_query("select * from cont_details left join cont_sold_tmp on cont_details.cont_details_id = cont_sold_tmp.cont_no where cont_sold_tmp.cont_no is null");
           while($res = mysql_fetch_array($qry))
              {
         ?>
         <option value="<?php echo $res["cont_details_id"];?>">
           <?php echo $res["cont_no"];?>
      </option>
     <?php } ?>
    </select>

数据库连接运行良好，而不是联接查询，我只是用简单的查询" select * from cont_details "进行了检查，它显示了所有记录.但是当我使用这个联接查询.我在下拉菜单中没有任何记录

Database connections are working perfectly, instead of join query i just checked with the simple query "select * from cont_details" its shows all the records. but when i use this join query. i dont get any records in dropdown

推荐答案

最后发现了我所做的错误-_-

And finally found the mistake what i did -_-

select cont_details.cont_details_id as cont_details_id,
cont_details.cont_no as cont_no
from cont_details left join cont_sold_tmp
on cont_details.cont_details_id = cont_sold_tmp.cont_no
where cont_sold_tmp.cont_no is NULL

合并表格后，我没有正确选择表格名称为(.)的列

after combining tables, i didn't choose column correctly with table name (.)

所以我使用时的结果<option value="<?php echo $res["cont_details_id"];?>">，它不会在那里退出，因此显示为空

so the result when i use<option value="<?php echo $res["cont_details_id"];?>"> , it doesnt exits there so its show empty

感谢您的回复:-)

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