'sqlplus' is not recognized as an internal or external command, operable program or batch file. (COMMAND PROMPT)

I had started to use my home-Laptop as a lab pc which i use seperately than one i use in my company.
The reason is to experiment oracle cases to experience the warnings,responds,results and to see how to overcome them.Shortly my pc is my cavy in my lab;)

If you had the same problem,the solution is simple. Just add your ORACLE_HOME path to your
Environment Variables. For instance;
To find ORACLE_HOME path. Look it up from registry;

Windows --->Run--->regedit--->HKEY_LOCAL_MACHINE
CTRL + F 
type ------>ORACLE_HOME 
Press----->Find

C:\oracle\BIToolsHome_1; 

Right Click Computer--> Advanced System Settings-->Advanced

                                          
Click Edit----- Add your ORACLE_HOME path to the very begining of line. Do not forget to put semi colon to separate it from other path and then click OK.