Advantage of having view

Question

Hi,
Good day all
My question is , I need to give a DB link to hit my table to other system for fetching some data.
Now confusion is, should I create a view of that table to should I give direct table access, there is only one table involved
Apart from the security I dont find any use of creating a view, and security is not a concern for me
Can you please suggest,what is the better approach and why?
Regards
N

Answer 1

SQL> create or replace view test2
as select employee_id, last_name from employees ,departments where employees.department_id=departments.department_id
and departments.department_id=10;
View created.
sql>select * from test2;
Execution Plan
Plan hash value: 389887213
| Id  | Operation                    | Name              | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |                   |     1 |    19 |     1   (0)| 00:00:01 |
|   1 |  NESTED LOOPS                |                   |     1 |    19 |     1   (0)| 00:00:01 |
|*  2 |   INDEX UNIQUE SCAN          | DEPT_ID_PK        |     1 |     4 |     0   (0)| 00:00:01 |
|   3 |   TABLE ACCESS BY INDEX ROWID| EMPLOYEES         |     1 |    15 |     1   (0)| 00:00:01 |
|*  4 |    INDEX RANGE SCAN          | EMP_DEPARTMENT_IX |     1 |       |     0   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - access("DEPARTMENTS"."DEPARTMENT_ID"=10)
sql>select employee_id, last_name from employees ,departments where employees.department_id=departments.department_id
and departments.department_id=10;
Execution Plan
Plan hash value: 389887213
| Id  | Operation                    | Name              | Rows  | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |                   |     1 |    19 |     1   (0)| 00:00:01 |
|   1 |  NESTED LOOPS                |                   |     1 |    19 |     1   (0)| 00:00:01 |
|*  2 |   INDEX UNIQUE SCAN          | DEPT_ID_PK        |     1 |     4 |     0   (0)| 00:00:01 |
|   3 |   TABLE ACCESS BY INDEX ROWID| EMPLOYEES         |     1 |    15 |     1   (0)| 00:00:01 |
|*  4 |    INDEX RANGE SCAN          | EMP_DEPARTMENT_IX |     1 |       |     0   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - access("DEPARTMENTS"."DEPARTMENT_ID"=10)