PHP能连接数据库但是不能create database,如何解决

PHP能连接数据库但是不能create database,怎么解决？
先贴代码：

PHP code

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<?php $con = mysql_connect("localhost");
if (!$con)
{
    die('Could not connect: ' . mysql_errno());
}
else
{
    echo "success" . "<br />";
}

if (mysql_query("CREATE DATABASE hello", $con))
{
    echo "Database created";
}
else
{
    echo "ERROR";
}

mysql_close($con);

?>

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