66.Oracle数据库SQL开发之 高级查询——使用线性回归函数

线性回归函数可以用普通最小平方回归曲线拟合一组数值对。线性回归函数可用于聚合、串口或报表函数。

如下图1：

例如：

store@PDB1> selectprd_type_id,regr_avgx(amount,month) as avgx,

regr_avgy(amount,month) as avgy,

regr_count(amount,month) as count,

regr_intercept(amount,month) as inter,

regr_r2(amount,month) as r2,

regr_slope(amount,month) as slope,

regr_sxx(amount,month) as sxx,

regr_sxy(amount,month) as sxy,

regr_syy(amount,month) as syy

fromall_sales

whereyear=2003 group by prd_type_id;

PRD_TYPE_ID    AVGX         AVGY     COUNT        INTER          R2    SLOPE            SXX          SXY

----------- ---------- -------------------- ---------- ---------- ---------- ---------- ----------

SYY

----------

1     6.5 12570.5811   72 13318.4543 .003746289-115.05741           858 -98719.26

3031902717

2     6.5 2588.62806   72 2608.11268   .0000508 -2.997634        858  -2571.97

151767392

5                                 0

4     6.5 5593.76611   72 2043.47164 .128930297546.199149          858 468638.87

1985337488

3     6.5 6642.65153   72 2154.23119 .126338815690.526206          858 592471.485

3238253324