Difference between values in 2 rows in SQL query

I have to find the difference between inventory onhand in the same store in week1 and week2.
I tried to do it in one "select" query something like :
SELECT store_id, ( suppose to be function that calculates difference) FROM my_table WHERE week=week1 or week=week2 GROUP BY store_id
however I have no idea how to find the difference between the valuues in two separate rows.
thanks in advance.

If you have only two weeks in your data. This can work.
SQL> select * from emp
2 /
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7839 KING PRESIDENT 17-NOV-81 5000 10
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7788 SCOTT      ANALYST         7566 09-DEC-82       3000                    20
      7876 ADAMS CLERK 7788 12-JAN-83 1100 20
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10
      8888 KING PRESIDENT 17-NOV-81 7000 10
      9999 ADAMS CLERK 7788 12-JAN-83 7000 20
16 rows selected.
SQL> select ename, max(sal) - min(sal) diff
2 from emp
3 group by ename
4 /
ENAME            DIFF
ADAMS 5900
ALLEN               0
BLAKE               0
CLARK               0
FORD                0
JAMES               0
JONES               0
KING 2000
MARTIN              0
MILLER              0
SCOTT               0
SMITH               0
TURNER              0
WARD                0
14 rows selected.
SQL> Cheers
Sarma.

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