AntDB-Oracle Compatibility Developer’s Manual P3–60

STDDEV_POP

This function calculates the overall standard deviation and returns the square root of the overall variable with the same return value as the square root of the VAR_POP function.

Example:

select deptno,ename,sal,stddev_pop(sal) over (partition by deptno) as pop from emp;
 DEPTNO | ENAME  |  SAL  |        POP        
---------------+------------+------------+-------------------
     10 | KING   | 10000 | 1546.142152441216
     10 | CLARK  |  7450 | 1546.142152441216
     10 | MILLER |  6300 | 1546.142152441216
     20 | SCOTT  |  8000 | 1195.339619336511
     20 | SMITH  |  6800 | 1195.339619336511
     20 | JONES  |  7975 | 1195.339619336511
     20 | FORD   |  8000 | 1195.339619336511
     20 | ADAMS  |  8100 | 1195.339619336511
     20 | SMITH  |  4800 | 1195.339619336511
     30 | ALLEN  |  7600 | 2057.506581601462
     30 | MARTIN |  6250 | 2057.506581601462
     30 | TURNER |  6500 | 2057.506581601462
     30 | JAMES  |  5950 | 2057.506581601462
     30 | BLAKE  | 11850 | 2057.506581601462
     30 | WARD   |  6250 | 2057.506581601462
(15 rows)