truncate command will remove the table and again recreate 
the table.
drop command will remove the table permanently from the 
database.


Function must return a value where as stored procedure may 
or may not return a value.
Function can return only one value where as stored 
procedure can return multiple values.
Function can be used in sql query where as stored procedure 
cannot be used in sql query.
Function is used to compute a value where as stored 
procedure can be used to perform a task