text: -- @testpoint: lengthb函数与where结合使用
  
  drop table if exists products;
  CREATE TABLE products
  ( product_id INTEGER,
    product_name VARCHAR2(60),
    category VARCHAR2(60)
  );
  
  INSERT INTO products VALUES
  (1502, 'olympus camera', 'electrncs'),
  (1601, 'lamaze', 'toys'),
  (1666, 'harry potter', 'toys'),
  (1700, 'wait interface', 'books'),
  (1702,'luoen','time'),
  (1672,'hemai','hogwarzi'),
  (1677,'hemai','liulaoshizi');
  
  select product_name from products where lengthb(category)>8;
  drop table if exists products;