MySQL如何删除数据库

drop database <数据库名>;

mysql> drop database RUNOOB;

[root@host]# mysqladmin -u root -p drop RUNOOB
Enter password:******

Dropping the database is potentially a very bad thing to do.
Any data stored in the database will be destroyed.
Do you really want to drop the 'RUNOOB' database [y/N] y
Database "RUNOOB" dropped

mysqli_query(connection,query,resultmode);

<?php
$dbhost = 'localhost'; // mysql服务器主机地址
$dbuser = 'root'; // mysql用户名
$dbpass = '123456'; // mysql用户名密码
$conn = mysqli_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
 die('连接失败: ' . mysqli_error($conn));
}
echo '连接成功<br />';
$sql = 'DROP DATABASE RUNOOB';
$retval = mysqli_query( $conn, $sql );
if(! $retval )
{
 die('删除数据库失败: ' . mysqli_error($conn));
}
echo "数据库 RUNOOB 删除成功\n";
mysqli_close($conn);
?>