Question

I have a MySQL database called “bookfeather.” It contains 56 tables. Each table has the following structure:

id site votes_up votes_down

The value for “site” is a book title. The value for “votes_up” is an integer. Sometimes a unique value for “site” appears in more than one table.

For each unique value “site” in the entire database, I would like to sum “votes_up” from all 56 tables. Then I would like to print the top 25 values for “site” ranked by total “votes_up”.

How can I do this in PHP?

Thanks in advance,

John

Answer 1

Here’s a PHP code snip that should get it done.
I have not tested it so it might have some typos and stuff, make sure you replace DB_NAME

$result = mysql_query("SHOW TABLES");
$tables = array();
while ($row = mysql_fetch_assoc($result)) {
    $tables[] = '`'.$row["Tables_in_DB_NAME"].'`';

}

$subQuery = "SELECT site, votes_up FROM ".implode(" UNION ALL SELECT site, votes_up FROM ",$tables);
// Create one query that gets the data you need
$sqlStr = "SELECT site, sum(votes_up) sumVotesUp
            FROM (
            ".$subQuery." ) subQuery
           GROUP BY site ORDER BY sum(votes_up) DESC LIMIT 25";
$result = mysql_query($sqlStr);
$arr = array(); 
while ($row = mysql_fetch_assoc($result)) { 
    $arr[] = $row["site"]." - ".$row["sumVotesUp"];
} 
print_r($arr)