STDDEV_SAMP

STDDEV_SAMP([ ALL ] expr) OVER (analytic_clause)

obclient> CREATE TABLE EMPLOYEES (MANAGER_ID INT,LAST_NAME VARCHAR(50),HIREDATE VARCHAR(50),SALARY INT);
INSERT INTO EMPLOYEES VALUES(100, 'RAPHAELY', '2017-07-01', 1700);
INSERT INTO EMPLOYEES VALUES(100, 'DE HAAN', '2018-05-01',11000);      
INSERT INTO EMPLOYEES VALUES(100, 'ERRAZURIZ', '2017-07-21', 1400);
INSERT INTO EMPLOYEES VALUES(100, 'HARTSTEIN', '2019-05-01',14000);     
INSERT INTO EMPLOYEES VALUES(100, 'RAPHAELY', '2017-07-22', 1700);
INSERT INTO EMPLOYEES VALUES(100, 'WEISS',  '2019-07-11',13500);     
INSERT INTO EMPLOYEES VALUES(100, 'RUSSELL', '2019-10-05', 13000);
INSERT INTO EMPLOYEES VALUES(100, 'PARTNERS',  '2018-12-01',14000);     
INSERT INTO EMPLOYEES VALUES(200, 'ROSS',  '2019-06-11',13500);     
INSERT INTO EMPLOYEES VALUES(200, 'BELL', '2019-05-25', 13000);
INSERT INTO EMPLOYEES VALUES(200, 'PART',  '2018-08-11',14000);   
COMMIT;

obclient> SELECT LAST_NAME,SALARY,STDDEV_SAMP(SALARY) OVER(ORDER BY HIREDATE) AS DEVISION FROM EMPLOYEES WHERE MANAGER_ID = 100;
+-----------+--------+--------------------+
 LAST_NAME  SALARY  DEVISION           
+-----------+--------+--------------------+
 RAPHAELY     1700                NULL 
 ERRAZURIZ    1400  212.13203435596427 
 RAPHAELY     1700  173.20508075688772 
 DE HAAN     11000   4702.127178203499 
 PARTNERS    14000   6064.899009876422 
 HARTSTEIN   14000   6340.346993658944 
 WEISS       13500    6244.31169717116 
 RUSSELL     13000   6026.474330580266 
+-----------+--------+--------------------+
8 rows in set (0.01 sec)