openGauss每日一练第1天 | 数据库创建表、插入记录、查询记录和删除表

连接openGauss

su - omm
gsql -r

课后作业

1.创建一个表products

CREATE TABLE products
(product_id integer,product_name char(30),category char(20));
comment on column products.product_id is '产品编号';
comment on column products.product_name is '产品名';
comment on column products.category is '种类';

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 (1601,'lamaze','toys'), (1700,'wait interface', 'Books'),(1666,'harry potter', 'toys');

3.查询表中所有记录及记录数

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 order by product_id;

5.查询表中category为toys的记录

select * from products where category='toys';

6.删除表products

drop table products;

end;