Set Apache Alias

If you want to put WordPress to sub folder you need to create file wp03.conf with following content:

Alias /wp03 "/var/www/wp03"
<Directory "/var/www/wp03">
 AllowOverride All
 Options FollowSymlinks
 Order deny,allow
 Deny from all
 Allow from all
 Require all granted
</Directory>

Now you can access your blog on http://localhost/wp03

Two aliases for the same MySQL table

Here's how to establish database relationships between connected entities. In this example we'll use a highways map. The final query will show city names and highway that connects them in  result set rows.

Map of highways:

Connections between cities