从表中选择colum1，column2，其中value = somevalue

Question

我想选择两列值并使用while，我试过但失败了。新手到php＆amp; Mysql ..

Mytable =类别↓

subcat1    |   subcat2   |   category  |
=======================================
High school| Pvt School  |   Education |
---------------------------------------
Jr College | Voc College |   Education |

=======================================

我的查询：

sql="select distinct subcat1, subcat2 from categories where category='Education'";
$category=mysql_query($sql);

    <?php
       while ($cat = mysql_fetch_assoc($category))
    {
    ?>

    <a href="Category.php"> <?php echo $cat['subcat']; ?></a>

我想得到的输出：

  

高中

私立学校

Jr College

  Voc学院

请帮帮我..♥衷心的感谢♥

Answer 1

在循环中回显两个值

<?php
    while ($cat = mysql_fetch_assoc($category)) { ?>
        <?php if($cat['subcat1']) { ?>
            <a href="Category.php"> <?php echo $cat['subcat1']; ?></a>
        <?php } if($cat['subcat1']) { ?>
            <a href="Category.php"> <?php echo $cat['subcat2']; ?></a>
        <?php } ?>
<?php } ?>

Answer 2

像下面这样的东西 -

while ($cat = mysql_fetch_assoc($category))
{
    ?>
    <?php
        if($cat['subcat1']!="") {
        ?>
            <a href="Category.php"> <?php echo $cat['subcat1']; ?></a>
    <?php } ?>
    <?php
        if($cat['subcat2']!="") {
        ?>
            <a href="Category.php"> <?php echo $cat['subcat2']; ?></a>
     ?php } ?>
<?php } //while close ?>

或最好仅将您的查询修改为

sql="select distinct subcat1, subcat2 from categories 
     where category='Education' AND subcat1<>'' AND subcat2<>''";