Display data in columns instead of rows?

Hi there, 

I've currently got my PHP echoing HTML code displaying the results of a MySQL statement in tables, for every department that there is, the page will display results per department in an additional table / row, and then for each store that there is there will be an additional set of the department tables as shown below:

This is all good but its clearly not necessary to display an entire table per record of department, per store, what I would really like is to be able to have a set of tables, just per store that there is (currently only 2 and 1 blank entry) rather than a table set per department. So ideally with the current data, there would be just 3 table sets (1 per store), but each table displaying the data per department in additional columns rather than sets of tables. 

The way I got around this before was to write an SQL statement per column, where I would specify in the statement which day to Group by. This was fine when I only needed 7 columns (for days of the week) as there wouldn't be anymore than 7 days or 7 SQL statements. However with departments, there could be anywhere between 30 & 999 departments, and as I am a beginner in the PHP & MySQL world I am quite stumped as to how to do this efficiently / properly. 

Can anyone advise me how to do this, or if I'm extremely fortunate show me an example? as I'm learning explanations are just as valuable as the answer. I hope how I've explained it isn't too long winded and makes sense, if anything doesn't please say so

Thank you in advance for any help. 

My code so far:

<?php
$connection = mysql_connect("localhost", "username", "password"); //connect to server with these creds, store in $connection variable
if (!$connection)
{die('Could not connect: ' . mysql_error());} //if $connection can not connect give error
mysql_select_db("db_name", $connection); //select database name for $connection

//sql select query for hour
$sql ="SELECT storeid, dept, SUM( qty ) AS  'Weekly Total Quantity', SUM( value ) AS  'Weekly Total Value', AVG( avgqty ) AS 'Weekly Average Quantity Per Hour', AVG( avgvalue ) AS  'Weekly Average Value Per Hour', SUM( value ) / SUM( qty ) AS 'Avg Value Per Item'
FROM depthour
GROUP BY dept, storeid
ORDER BY storeid, dept"; 
//echo "SQL Query used: "; echo $sql;

$query = mysql_query($sql); //give resource the variables

while ($row = mysql_fetch_array($query)) {  //display results for hour entered by user
if (!$query) { // add this check.
    die('Invalid query: ' . mysql_error());
}
echo "<table border='1' cellpadding='2' cellspacing='3' width='70%'>";

echo "<tr><th colspan='2'>Weekly Statistics for Store: ".$row['storeid'];
echo "</th></tr>";

echo "<tr><td width ='40%'>Department: </td><td width ='30%'>" .$row['dept']; 
echo "</td></tr>";

echo "<tr><td>Weekly Total Quantity: </td><td>" .$row['Weekly Total Quantity']; 
echo "</td></tr>";

echo "<tr><td>Weekly Total Value: </td><td>" .$row['Weekly Total Value']; 
echo "</td></tr>";

echo "<tr><td>Weekly Average Quantity Per Hour: </td><td>" .$row['Weekly Average Quantity Per Hour']; 
echo "</td></tr>";

echo "<tr><td>Weekly Average Value Per Hour: </td><td>" .$row['Weekly Average Value Per Hour']; 
echo "</td></tr>";

echo "<tr><td>Avg Value Per Item: </td><td>" .$row['Avg Value Per Item']; 
echo "</td></tr>";

echo "</table><br>";
};



?>