drop table t_n21;
create table t_n21 (id int,px int,y decimal,x decimal);

insert into t_n21 values (101,1,1,1);
insert into t_n21 values (201,2,1,1);
insert into t_n21 values (301,3,1,1);
insert into t_n21 values (401,4,1,11);
insert into t_n21 values (501,5,1,null);
insert into t_n21 values (601,6,null,1);
insert into t_n21 values (701,6,null,null);
insert into t_n21 values (102,1,2,2);
insert into t_n21 values (202,2,1,2);
insert into t_n21 values (302,3,2,1);
insert into t_n21 values (402,4,2,12);
insert into t_n21 values (502,5,2,null);
insert into t_n21 values (602,6,null,2);
insert into t_n21 values (702,6,null,null);
insert into t_n21 values (103,1,3,3);
insert into t_n21 values (203,2,1,3);
insert into t_n21 values (303,3,3,1);
insert into t_n21 values (403,4,3,13);
insert into t_n21 values (503,5,3,null);
insert into t_n21 values (603,6,null,3);
insert into t_n21 values (703,6,null,null);
insert into t_n21 values (104,1,4,4);
insert into t_n21 values (204,2,1,4);
insert into t_n21 values (304,3,4,1);
insert into t_n21 values (404,4,4,14);
insert into t_n21 values (504,5,4,null);
insert into t_n21 values (604,6,null,4);
insert into t_n21 values (704,6,null,null);
insert into t_n21 values (800,7,1,1);


explain select px,var_pop(x),var_pop(y),corr(y,x),covar_samp(y,x),covar_pop(y,x),regr_count(y,x),regr_slope(y,x),
regr_intercept(y,x), regr_r2(y,x), regr_sxx(y,x), regr_syy(y,x), regr_sxy(y,x), regr_avgx(y,x), regr_avgy(y,x), regr_count(y,x)
 from t_n21 group by px order by px;

select px,
	round(	var_pop(x),5),
	round(	var_pop(y),5),
	round(	corr(y,x),5),
	round(	covar_samp(y,x),5),
	round(	covar_pop(y,x),5),
	regr_count(y,x),
	round(	regr_slope(y,x),5),
	round(	regr_intercept(y,x),5),
	round(	regr_r2(y,x),5),
	round(	regr_sxx(y,x),5),
	round(	regr_syy(y,x),5),
	round(	regr_sxy(y,x),5),
	round(	regr_avgx(y,x),5),
	round(	regr_avgy(y,x),5),
	round(	regr_count(y,x),5)
 from t_n21 group by px order by px;


select id,regr_count(y,x) over (partition by px) from t_n21 order by id;