text: -- @testpoint: covar_samp函数返回结果用于create table as select
  drop table if exists T_VAR_POP_SAMP_VARIANCE01;
  CREATE TABLE  T_VAR_POP_SAMP_VARIANCE01(
       COL_1 integer,
       COL_2 number(19,0), 
       COL_3 number(10,6));
  insert into T_VAR_POP_SAMP_VARIANCE01 values(7,312.245,7+445.255);
  insert into T_VAR_POP_SAMP_VARIANCE01 values(5,112.245,7+443.255);
  DROP TABLE IF EXISTS T_VAR_SAMP_DEFALUT03;
  CREATE TABLE T_VAR_SAMP_DEFALUT03 as SELECT covar_samp(COL_2,COL_2) as a FROM T_VAR_POP_SAMP_VARIANCE01 group by COL_1,COL_2,COL_3; 
  select * from T_VAR_SAMP_DEFALUT03 order by 1;
  DROP TABLE IF EXISTS T_VAR_SAMP_DEFALUT03;
  CREATE TABLE T_VAR_SAMP_DEFALUT03 as SELECT covar_samp(COL_2-COL_3,COL_2-COL_3) as a FROM T_VAR_POP_SAMP_VARIANCE01;
  select * from T_VAR_SAMP_DEFALUT03 order by 1;
  DROP TABLE IF EXISTS T_VAR_SAMP_DEFALUT03;
  drop table if exists T_VAR_POP_SAMP_VARIANCE01;