Question

I have 12 mysql db table like table1, table2,….table12. each table has 200,000 records. each record includes country, user-type, package column. i want to get a statistic of above 3 column. to do it, first, i am creating array. then using the array, i am getting the stat data.

for ($i=1; $i<=12; $i++)
{
   $query="SELECT `country`, `usertype`, `package` FROM `table$i`";
   $result=mysql_query($query);
   while ($row = mysql_fetch_assoc($result))
   {
      $country= $row['country'];
      $usertype= $row['usertype'];
      $package= $row['package'];

      $stat_array[$country][$usertype][$package]= 1 + $stat_array[$country][$usertype][$package]
   }
}

It take lot of time to get result. Is this a best way to get statistic? please advice me a good method. also, will this use more RAM memory. i need a way to get with less memory usage

Thanks in advance

Answer 1

12 queries? Just notice, that there is UNION command in SQL.
Try out this:

for ($i=1; $i<=12; $i++)
   $query=($i>1?'UNION ALL ':'')."SELECT `country`, `usertype`, `package` FROM `table$i` ";
$result=mysql_query($query);
// other code below