local and global variable in sql server with example

Example 1: global variables in sql

Global variables:
These variables are the variables which
can be accessed throughout the program.
Global variables cannot be created
whenever that function is called.

Local variables:
These variables can be used or exist 
only inside the function. These variables
are not used or referred by any other function.

Example 2: local vs global variables in sql

Local variables:
These variables can be used or exist 
only inside the function. These variables
are not used or referred by any other function.

Global variables:
These variables are the variables which
can be accessed throughout the program.
Global variables cannot be created
whenever that function is called.