SUM

SUM([ DISTINCT  ALL ] expr) OVER (analytic_clause)

obclient> CREATE TABLE EXPLOYEES(LAST_NAME CHAR(10), SALARY DECIMAL, JOB_ID CHAR(32));
Query OK, 0 rows affected (0.08 sec)

obclient> INSERT INTO EXPLOYEES VALUES('JIM', 2000, 'CLEANER');
Query OK, 1 row affected (0.11 sec)

obclient> INSERT INTO EXPLOYEES VALUES('MIKE', 12000, 'ENGINEERING');
Query OK, 1 row affected (0.00 sec)

obclient> INSERT INTO EXPLOYEES VALUES('LILY', 13000, 'ENGINEERING');
Query OK, 1 row affected (0.00 sec)

obclient> INSERT INTO EXPLOYEES VALUES('TOM', 11000, 'ENGINEERING');
Query OK, 1 row affected (0.01 sec)

obclient> SELECT LAST_NAME, SUM(SALARY) OVER (PARTITION BY JOB_ID) TOTAL_S FROM EXPLOYEES;
+-----------+---------+
 LAST_NAME  TOTAL_S 
+-----------+---------+
 JIM           2000 
 MIKE         36000 
 LILY         36000 
 TOM          36000 
+-----------+---------+
4 rows in set (0.01 sec)