How to display database records in the view without repeating a field?

Question

In my database I have two tables one politics (politics_id, politics, politics_type_id) and other tipo_politics (politics_type_id, politics_type).
This is the table

Answer 1

If you make a query like this, then you'll get a row for the type as well as the actual politics:

select tp.politics_type_id, tp.politics_type politics_text, null politics_id,  1 row_type
from tipo_politics tp
union
select p.politics_type_id, p.politics politics_text, p.politics_id, 2 row_type
from politics p
order by politics_type_id, row_type, politics_id;

This gives results like this:

+------------------+---------------+-------------+----------+
| politics_type_id | politics_text | politics_id | row_type |
+------------------+---------------+-------------+----------+
|                1 | general       |             |        1 |
|                1 | Politic 1     |           1 |        2 |
|                1 | magic         |           3 |        2 |
|                1 | love          |           4 |        2 |
|                2 | life          |             |        1 |
|                2 | hello world   |           2 |        2 |
+------------------+---------------+-------------+----------+

Now you can loop through the results, and only act on the header rows (where row_type = 1). Then within that loop, do another loop and pick out the detail rows (where row_type = 2).

<?php
   for ($j = 0; $j < $contador; $j++) {
     if($list_politic[$j]['row_type'] == 1){
 ?>
   <div class="content-layout">
         <p>
           <span>
                <?php echo $list_politic[$j]['politics_text']; ?> 
           </span> 
         </p>
    </div>
    <div>
      <ul style="text-indent: 0px;">
         <li>
          <?php for($i=0; $i < $contador; $i++) {
                if($list_politic[$i]['row_type'] == 2 && $list_politic[$i]['politics_type_id'] == $list_politic[$j]['politics_type_id']) {
          ?>
             <span>
                   <?php echo $list_politic[$j]['politics_text']; ?>   
             </span>
            <?php } // if ?>
           <?php } // for i ?>
         </li> 
       </ul>
    </div>
   <?php } // for if ?>
 <?php } // for j ?>

Answer 2

It looks like you want the headers to be displayed only when there's a change in politics_type. This would require keeping a track of its value in every iteration and the logic can thus be constructed as follows:

<?php
$previous_politics_type = "";
for ($j = 0; $j < $contador; $j++) {
    if($previous_politics_type != $list_politic[$j]['politics_type']){  // <-- new if condition
?>

        <div class="content-layout">
            <p>
                <span>
                    <?php echo $list_politic[$j]['politics_type']; ?> 
                </span> 
            </p>
        </div>
<?php
    }       // <-- end if
    $previous_politics_type = $list_politic[$j]['politics_type'];
?> 
    <div>
        <ul style="text-indent: 0px;">
            <li>
                <span>
                    <?php echo $list_politic[$j]['politicas']; ?>   
                </span>
            </li> 
        </ul>
    </div>
<?php 
} // for j 
?>

The layout of the <div>s above may or may not be exactly as you need, but hopefully it should give an idea on how to use the new $previous_politics_type variable.