AntDB-Oracle Compatibility Developer’s Manual P3–62

VAR_POP

This function returns the overall variance of the grouped series.

Example:

SELECT empno, sal, VAR_pop(sal) OVER (ORDER BY hiredate) as "var_pop"
FROM emp ORDER BY ename, sal, "var_pop" ;

EMPNO |  SAL  |       var_pop        
------------+----------+----------------------
  7876 |  8100 | 2799183.333333333333
  7499 |  7600 | 1386666.666666666667
  7698 | 11850 | 4748003.472222222222
  7782 |  7450 | 4070841.836734693878
  7902 |  8000 | 3328381.076388888889
  7900 |  5950 | 3328381.076388888889
  7566 |  7975 |              1251400
  7839 | 10000 |           3729306.25
  7654 |  6250 | 3401111.111111111111
  7934 |  6300 | 3166597.633136094675
  7788 |  8000 | 2967286.352040816327
  7469 |  4800 |              1000000
  7369 |  6800 |              1000000
  7844 |  6500 |       3678505.859375
  7521 |  6250 |           1044218.75
(15 rows)

VAR_SAMP

This function returns the sample variance of the grouped series.

For example:

SELECT empno, sal, VAR_samp(sal)  OVER (ORDER BY hiredate) as "var_samp"
FROM emp ORDER BY ename, sal, "var_samp" ;

 EMPNO |  SAL  |       var_samp       
-------+-------+-----------------------
  7876 |  8100 |              2999125
  7499 |  7600 |              2080000
  7698 | 11850 | 5697604.166666666667
  7782 |  7450 |  4749315.47619047619
  7902 |  8000 | 3630961.174242424242
  7900 |  5950 | 3630961.174242424242
  7566 |  7975 |              1564250
  7839 | 10000 | 4143673.611111111111
  7654 |  6250 |              3826250
  7934 |  6300 | 3430480.769230769231
  7788 |  8000 | 3195539.148351648352
  7469 |  4800 |              2000000
  7369 |  6800 |              2000000
  7844 |  6500 | 4204006.696428571429
  7521 |  6250 | 1392291.666666666667
(15 rows)