每日一练：openGauss数据库在线实训课程 ## 第一天作业

1.创建一个表products

CREATE TABLE products
( product_id integer,   
  product_name char(30),    
  category char(30)
) ;

2.向表中插入数据，采用一次插入一条和多条记录的方式

INSERT INTO products (product_id, product_name, category) VALUES (1502, 'olympus camera', 'electrncs');

INSERT INTO products (product_id, product_name, category) VALUES    
(1502, 'olympus camera', 'electrncs'),    
(1601, 'lamaze','toys'),    
(1700, 'wait interface', 'Books'),
(1666, 'harry potter', 'toys');

3.查询表中所有记录及记录数

\dt products
select * from products;
select count(*) from products;

4.查询表中所有category记录，并将查询结果按升序排序

select category from products;
select category from products order by category;
select category, product_name from products order by category desc, product_name asc;

5.查询表中category为toys的记录

select * from products where category='toys';

6.删除表products

drop products;

• 1.1 openGauss创建表、插入记录、查询记录和删除表基本使用