Q:

Installing mysql server with postgresql

I'm using backbox 4.4 which it was built-in with postgresql.  Yesterday i think about "can i installing mysql database along side postgresql database ? ",  i want to learn database connection but i so unfamiliar with postgresql, what i want to ask is :

Can postgresql and mysql run together in the same machine ? 
If it can't, why so? 
If it can, can you tell me how to configure mysql database to run with postgresql ?  Or give me some reference. 

Thanks. 

A:

Can postgresql and mysql run together in the same machine ? 

yes. 

If it can, can you tell me how to configure mysql database to run with postgresql ?  Or give me some reference. 

Ehm.  There is no conflict between the 2 so you install mysql the normal way (sudo apt-get install mysql-server) , you install postgres (sudo apt-get install postgresql postgresql-contrib) the normal way.  And then you basically create a user, set permissions and create a database.  Using some kind of software to create a DBI connector and of you go. 
The 2 run on different ports so there is nothing to hinder each other.  The only thing: both will try to use the most out of your machine and compete for I/O, network access and memory so one of them is likely to slow down significantly if the other is doing something heavy.