sort data when loop by a calculated column - php

Question

someone can help me to sort this table by calculated $changepercentage please.
My table has more than 1000 records and it's uploaded by date order . I tried arsort() , SORT() when it's echo but PHP says it's not an array but a string.
I have tried mysqli_fetch_array() also but no luck.
need your kind help.
clo_prices (table)
date | name | cl_price |
2015-09-15 | AAA | 10 |
2015-09-15 | BAA | 20 |
2015-09-15 | ABA | 30 |
2015-09-16 | AAA | 86 |
2015-09-16 | BAA | 65 |
2015-09-16 | ABA | 33 |
price_list (table)
date | name | volume | last |
2015-09-15 | AAA | 6655245 | 56 |
2015-09-15 | ABA | 5666 | 65 |
2015-09-15 | AAB | 1333 | 33 |
2015-09-16 | AAA | 112365 | 56 |
2015-09-16 | ABA | 23131 | 8 |
2015-09-16 | AAB | 23330 | 12 |
2015-09-16 | ABB | 2323122 | 60 |
2015-09-16 | ACB | 21222 | 99 |
Desired Result
date | company | closing | volume | Change % |
2015-09-16 | AAA | 56 | 6655245 | 66 |
2015-09-16 | ABA | 65 | 5666 | 9.7 |
2015-09-16 | ACB | 69 | 1333 | 7 |
2015-09-16 | AAB | 33 | 112365 | 3.2 |
$queryTMG = "SELECT price_list.date, price_list.name, price_list.last, price_list.volume,
clo_prices.date, clo_prices.name, clo_prices.cl_price
FROM price_list
INNER JOIN clo_prices
ON price_list.name = clo_prices.name
WHERE price_list.date= '$dateT' AND
clo_prices.date = '$dateT'
ORDER BY cl_price DESC LIMIT 10 ";
$queryPMG = "SELECT price_list.date, price_list.name, price_list.last, price_list.volume,
clo_prices.date, clo_prices.name, clo_prices.cl_price
FROM price_list
INNER JOIN clo_prices
ON price_list.name = clo_prices.name
WHERE price_list.date= '$dateT' AND
clo_prices.date = '$dateP'
ORDER BY cl_price DESC LIMIT 10";
$resultTMG = mysqli_query($dbc, $queryTMG) or die (mysqli_error());
$resultPMG = mysqli_query($dbc, $queryPMG) or die (mysqli_error());
echo '<table cellpadding = 15 border =1>';
echo '<tr>
<th>Company</th>
<th>Closing Rs.</th>
<th>Volume</th>
<th>Change %</th>
</tr>';
while($rowTMG = mysqli_fetch_assoc($resultTMG) AND $rowPMG = mysqli_fetch_assoc($resultPMG))
{
echo '<tr> <td>'. $rowTMG['name']. '</td>';
echo '<td>'. $rowTMG['last']. '</td>';
echo '<td align = "right">'. $volumeTMG = number_format($rowTMG['volume']). '</td>';
echo '<td align = "right">'.$changeprecentage =
number_format((( $rowTMG['cl_price'] - $rowPMG['cl_price'] ) /
$rowTMG['cl_price']), 2, '.', '' ). '</td> </tr>';
}
echo '</table>';

Answer 1

I probably have not quite understood yet how you compute your percentages, because using the data given I get different results, see my fiddle here
SELECT p.date, p.name, p.last, p.volume,
d.cl_price+0 prevprice,
c.cl_price+0 currprice,
100*(c.cl_price-d.cl_price)/c.cl_price perc_change
FROM price_list p
INNER JOIN clo_prices c ON p.name = c.name -- current prices
AND p.date = c.date
INNER JOIN clo_prices d ON p.name = d.name -- previous prices
AND '2015-09-15' = d.date
WHERE p.date= '2015-09-16'
ORDER BY perc_change desc
This solution is so far only a MySQL select statement, since everything can be done in a single query. You will probably have to sort out some of the logic or the input data.
For the purpose of the example I assumed that $dateT is '2015-09-16' and $dateP is '2015-09-15'.