Question

Please i need your help with how to optimize my query. I want to fetch 10 different rows data from the same table.

Here is one of the queries

     $query1 = mysql_query("SELECT m.Course_code AS 'Course', m.score, m.grade
                   FROM maintable AS m  
                   INNER JOIN students AS s ON
                   m.matric_no = s.matric_no
                   INNER JOIN Courses AS c ON
                   m.Course_code = c.Course_code
                   WHERE m.matric_no = '".$matric_no."'
                   AND m.semester_name = 'hamattarn'
                   AND m.level = '100' ") or die (mysql_error());

                  $number_cols1 = mysql_num_fields($query1) ;

this part of the query is changing for all the queries

  AND m.semester_name = 'hamattarn'
                   AND m.level = '100' "

 AND m.semester_name = 'rain'
                   AND m.level = '100' "

 AND m.semester_name = 'hamattarn'
                   AND m.level = '200' "

 AND m.semester_name = 'rain'
                   AND m.level = '200' "

  AND m.semester_name = 'hamattarn'
                   AND m.level = '300' "

  AND m.semester_name = 'rain'
                   AND m.level = '300' "

  AND m.semester_name = 'hamattarn'
                   AND m.level = '400' "

  AND m.semester_name = 'rain'
                   AND m.level = '400' "

 AND m.semester_name = 'hamattarn'
                   AND m.level = '500' "

 AND m.semester_name = 'rain'
                   AND m.level = '500' "

Here’s a picture of what i’ve being able to achieve with the query. After optimization i still want it to look this way.

< href=”http://i.imgur.com/IGEj2.png&#8221;>Sample Picture

thanks for you time and patience.

UPDATE — here is how i was displaying the row tables from each of the 10 queries before the optimization.. Please how can i achieve this table type reult with the new optimized query?

   echo "<table class=\"altrowstable\" id = " bgcolor = gold >\n";
     echo "<tr align=center>\n";
     for ($i=0; $i<$number_cols10; $i++)
     {
               echo "<th>" . mysql_field_name($query10, $i). "</th>";
     }
     echo "</tr>\n";
               while ($row = mysql_fetch_row($query10))
    {
    echo "<tr align=center>\n";
    for ($i=0; $i<$number_cols10; $i++)
    {
    echo "<td>";
    if (!isset($row[$i]))
    {echo "NULL";}
    else
    {
    echo "<b>".$row[$i]."</b>";
    }
    echo "</td>\n";
    }
    echo "</tr>\n";
    }
    echo "</table>"; 
    echo"</span>" ;

thanks

Answer 1

Why not something like this:

WHERE m.semester_name IN ('rain', 'hamattarn') 
  AND m.level IN ('100', '200', '300', '400', '500'))

As the results will be mixed, you should get the results in an expectable order, for example:

ORDER BY m.semester_name, m.level

This will allow you to split the results in PHP, something like this is common:

$previous_semester = $previous_level = false;
foreach(mysql_fetch_array($query) as $row) {
    if ($previous_semester == $row['semester_name']) {
        // row semester is different from the previous one
        echo $row['semester_name'];
    }

    if ($previous_level == $row['level']) {
        // row level is different from previous one
        echo $row['level']; 
    }

    print_r($row);

    $previous_level = $row['level'];
    $previous_semester = $row['semester_name'];
}

You could open an HTML table before the for loop.
When the semester or level changes, you could close the previous table and open a new one, add a title for the rest of the rows of the same semester/level, etc, etc…
You could close an HTML table after the for loop.

It’s a little tricky but eventually it will get you there.