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    <p>This is somewhat at the edge of practicality, but I'm approaching this problem more as an exercise in "doing it right."</p> <p>I would do a simple select of each table and insert in to an array:</p> <pre>$query1 = "SELECT * FROM cities"; $query2 = "SELECT * FROM prices"; $results1 = mysql_query( $query1 ); $results2 = mysql_query( $query2 ); while( $rows = mysql_fetch_array( $results1 ) ) $cities[] = $row['name']; while( $rows = mysql_fetch_array( $results2 ) ) $prices[] = array( $row['city1_id'], $row['city2_id'], $row['name'] ); </pre> <p>I would then use this to dynamically create two javascript lists:</p> <pre>$java_array1 = "var Cities = new Array;\n"; foreach( $cities as $key=>$city ) $java_array1 .= "Cities[$key] = \"$city\";\n"; $java_array2 = "var Prices = new Array;\n"; foreach( $cities as $key=>$price ) $java_array2 .= "Prices[$key] = new Array( \"{$price[0]}\", \"{$price[1]}\", \"{$price[2]}\", );\n";</pre> <p>I would next output a table with carefully crafted ids for each cell. I would use code very similar to that in the first answer, but I would give each cell a unique id of <code>"cell-&lt;row&gt;-&lt;col&gt;"</code>.</p> <p>The last thing I would do would be whip up some <code>onload</code> javascript which would populate the table using the appropriate pairings. My javascript is quite rusty, but it would look something like this (NOTE: pseudocode follows):</p> <pre>n = 1; for( var i in cities ) { // set city names on the diagonal document.getElementById( 'cell-'&i&'-'&i ).innerHTML = names[i]; n = n + 1; } for( var j in prices ) { // use the city IDs in the prices array (see earlier code initializing // prices array) to place the prices document.getElementById( 'cell-'&prices[1]&'-'&prices[2] ).innerHTML = prices[0]; }</pre> <p>I almost certainly messed up some of that javascript; use at your own risk.</p> <p>This is a lot more complex than the simpler answer given above, but this is the only way I can think of doing it so that it makes "sense." Basically, with this method, you place everything where it <em>should</em> be, and you don't have to worry about odd tables and weird selects.</p>
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