在while循环中从表中选择每个PHP

Question

I'm having trouble with the following code. I want to select from DB first and get some array, after that select from the same table based on each of the elements on the array.

Problem 1: The second select while loop only returns one row from table wheres there are more than one rows matching what i'm selecting. I want to return five rows for each returned row from the first while loop.

Q.1 What's wrong with my code?

Problem two: I'm building an array from a column that has repeating contents. eg returned results might be:

[Array]
1.John
2.Cane
3.Mary
4.John.

Now when john repeats, i get the same results as the one that was returned at '1'. I know this is expected.

Q2: How do i avoid selecting the same contents in a row?

Notes: i'm aware of the deprecated mysql.

PHP CODE

<?php
require_once 'php/db_conx.php';
$log = mysql_query("SELECT * FROM ads WHERE section != ''") or die(mysql_error());
while ($row = mysql_fetch_array($log)) {
    $LibSection[] = $row['section'];
}
foreach ($LibSection as $Section) {
    $log2 = mysql_query("SELECT * FROM ads WHERE section = '$Section' limit 5") or die(mysql_error());
    include_once 'php/Random_color.php';
    while ($row = mysql_fetch_array($log2)) {
        echo '<a class="LibSectOpen">
<span style="display:none" class="SectionName">' . $Section . '</span>
<div class="LibrarySects"><div class="LibrarySectsHeader">' . $Section . '</div><div class="LibrarySectsShelf">
<div class="LibrarySectsShelf_Book" style="background-color:' . $Color . '" title="Author: ' . $row['bbookauthor'] . '">' . $row['bbookname'] . '</div></div></div></a>';
    }
}
?> 

Answer 1

I think you will be able to skip this problem by using MySQL DISTINCT operator.

Here is an useful tutorial:

http://www.mysqltutorial.org/mysql-distinct.aspx

Answer 2

You are required to choose distinct values so use it:

SELECT DISTINCT * FROM Table_NAME where condition=value;

possible solution is W3schools.com- distinct example