$result1 = mysql_query ("SELECT * FROM table1 WHERE id='19'");
$myrow1 = mysql_fetch_array($result1);
echo $myrow1[pl1]; // Выводит: Alex Campbell
$result01 = mysql_query ("SELECT count(*) FROM table2 WHERE name='$myrow1[pl1]'");
$myrow01 = mysql_fetch_array($result01);
echo $myrow01[0]; // Выводит: 0
А если,
$result01 = mysql_query ("SELECT * FROM table2 WHERE name='Alex Campbell'");
$myrow01 = mysql_fetch_array($result01);
echo $myrow01 [pl1]; Выводит: Alex Campbell
$myrow1 = mysql_fetch_array($result1);
echo $myrow1[pl1]; // Выводит: Alex Campbell
$result01 = mysql_query ("SELECT count(*) FROM table2 WHERE name='$myrow1[pl1]'");
$myrow01 = mysql_fetch_array($result01);
echo $myrow01[0]; // Выводит: 0
А если,
$result01 = mysql_query ("SELECT * FROM table2 WHERE name='Alex Campbell'");
$myrow01 = mysql_fetch_array($result01);
echo $myrow01 [pl1]; Выводит: Alex Campbell