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POPHP echo repeating rows only once
 

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    <p>I have 2 tables. One table is 'headings' &amp; contains Headings and the other one is 'sub-headings' and contains Sub-headings that are (&amp; must be) classified under the Headings and must have a respective Heading. A Sub-Heading can have only one Heading and many sub-headings can have the same Heading. So consider the following format:</p> <pre><code>--Table heading heading_id heading 1 H1 2 H2 3 H3 --Table sub_heading sub_head_id sub_heading heading_id 1 SH1 1 2 SH2 1 3 SH3 2 4 SH4 3 5 SH5 2 6 SH6 4 </code></pre> <p>What I would like to do is query the database only once and get all sub_headings and their corresponding headings (using Inner Join?) and output a Heading only once and list all the sub_headings listed under their respective Heading. So, in practice, I would like to show up the <strong>OUTPUT RESULT AS</strong>:</p> <pre><code>H1 --SH1 --SH2 H2 --SH3 --SH5 H3 --SH4 H4 --SH6 </code></pre> <p>As you can see, the Headings are echo'ed only once and all the sub-headings that belong to a Heading are nicely shown under their respective Heading. So I would like to know what query I would write to do so.</p> <p><strong>NOTE:</strong> I have already written a code to fetch heading_id and while doing so in a loop, query the database for the respective sub-headings. This again results in loop of the sub_headings. But (I feel) the drawback in this is that for every single Heading that exists, the DB will be queried at least once to get their corresponding sub_headings. So if 50 Headings exist, while fetching them in a loop, a 2nd query is done to get the sub-headings. This needs me to write down a second query to get the sub-headings and process them in a loop. I want to avoid this.</p> <p>So it would really help if anyone can tell me how to query the DB only once and output the result as I have indicated above. Thanks in advance.</p>
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