text: -- @testpoint: 函数regr_intercept，根据所有输入的点(X, Y)按照最小二乘法拟合成一个线性方程，然后返回该直线的Y轴截距
  
  drop table if exists table_test;
  create table table_test(id integer,
  name varchar(10),
  age integer,
  height decimal(5,2),
  hobbies text,
  tel bigint
  );
  insert into table_test values(1, '张三', 12, 156.23, 'sings', 12355551895),
  (7, '李四', 15, 146.45, 'read books', 12866661265),
  (3, '李华', 18, 160.55, 'Dancing', 11822220366),
  (5, '赵六', 18, 170.55, 'Playing games', 13344443322);
  select regr_intercept(tel, height)from  table_test;
  select regr_intercept(height, id)from  table_test where id <5;
  select regr_intercept(age, id)from  table_test where id <9;
  drop table table_test;