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[code]
<?php
$sql_board = "select * from g5_board";
$res_board = mysql_query($sql_board);
$total_recordes = mysql_num_rows($res_board);
for ($j=0; $row_board=sql_fetch_array($res_board); $j++) {

if ($total_recordes-1 == $j) {
$sql_data .= "select * from g5_write_".$row_board[bo_table]." where wr_is_comment=0 ";
} else if ($j == 0){
$sql_data = "select * from g5_write_".$row_board[bo_table]." where wr_is_comment=0 union all " ;
} else {
$sql_data .= "select * from g5_write_".$row_board[bo_table]." where wr_is_comment=0 union all " ;
}
}

$sql_data .= " order by rand() limit 10";
$res_data = mysql_query($sql_data);
for ($i=0; $row=sql_fetch_array($res_data); $i++) {
echo $row[wr_subject]."<br>";
}?>
[/code]