oracle資料庫之統計分析(方差、標準差、協方差)
阿新 • • 發佈:2019-01-08
SELECT deptno,
ename, --st_name || ' ' || last_name employee_name,
hiredate,
sal,
STDDEV (sal) OVER (PARTITION BY deptno ORDER BY hiredate)
AS "STDDEV", --標準差
STDDEV_SAMP (sal) OVER (PARTITION BY deptno ORDER BY hiredate)
AS "STDDEV_SAMP", --樣本標準差
VAR_POP (sal) OVER (PARTITION BY deptno ORDER BY hiredate)
AS "VAR_POP", --方差
VAR_SAMP (sal) OVER (PARTITION BY deptno ORDER BY hiredate)
AS "VAR_SAMP" --樣本方差FROM scott.emp
WHERE deptno IN (20);