仅显示记录的一部分？

Question

我试图只显示文本记录的一部分。

    +---+---------+------------------+-------+
    |No.| File ID | File Desc.       |Status |
    +---+---------+------------------+-------+
    |1  | 400/4   | 1 - Test 1 400/4 |       |
    +---+---------+------------------+-------+
    |2  | 400/1   | 5 - Test 5 400/1 |       |
    +---+---------+------------------+-------+

我想要实现的是在文件Desc上仅在“-”之前显示文本。这样的专栏？

    +---+---------+------------------+-------+
    |No.| File ID | File Desc.       |Status |
    +---+---------+------------------+-------+
    |1  | 400/4   |        1         |       |
    +---+---------+------------------+-------+
    |2  | 400/1   |        5         |       |
    +---+---------+------------------+-------+

有可能吗？下面是用于显示该列的代码段。

<?php

$sql = "SELECT * FROM minit WHERE CONCAT(`file_id`) LIKE '%".$strKeyword."%'
          AND CONCAT(`file_desc`) LIKE '%".$strKeyword2."%'
          AND CONCAT(`minit_summ`) LIKE '%".$strKeyword3."%'";
$query = mysqli_query($dbConn,$sql);

while($result=mysqli_fetch_array($query,MYSQLI_ASSOC))
{
?>
  <tr>
      <td><div align="center"><?php echo $result["file_desc"];?></div></td>
  </tr>
<?php
}
?>