openGauss每日一练第1天 | 创建表、插入记录、查询记录和删除表基本使用

root@modb:~#
root@modb:~# su - omm
omm@modb:~$ gsql -r
gsql ((openGauss 2.0.0 build 78689da9) compiled at 2021-03-31 21:03:52 commit 0 last mr )
Non-SSL connection (SSL connection is recommended when requiring high-security)
Type "help" for help.

1.创建一个表products

omm=# create table products
omm-# (
omm(# product_id integer,
omm(# product_name char(30),
omm(# category char(20)
omm(# );
CREATE TABLE

2.向表中插入数据，采用一次插入一条和多条记录的方式

采用一次插入一条:

omm=# insert into products (product_id,product_name,category)
omm-# values(1502, 'olympus camera','electrncs');
omm=# insert into products (product_id,product_name,category)
omm-# values(1601, 'lamaze','toys');
omm=# insert into products (product_id,product_name,category)
omm-# values(1700, 'wait interface','Books');
omm=# insert into products (product_id,product_name,category)
omm-# values(1666, 'harry potter','toys');

采用多条记录的方式:

omm=# insert into products(product_id,product_name,category)values(1502, 'olympus camera','electrncs'),
omm-# (1601, 'lamaze','toys'),(1700, 'wait interface','Books'),(1666, 'harry potter','toys');

3.查询表中所有记录及记录数

omm=# select * from products;

omm=# 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

omm=# select category from products order by category;

5.查询表中category为toys的记录

omm=# select * from products where category = 'toys';

6.删除表products

drop table products;
DROP TABLE