#这是opengauss的第一天学习
学习opengauss基本的标的相关操作，包括建表，插入数据，查询数据，以及删除表。
向表中插入数据，采用一次插入一条和多条记录的方式
omm=# insert into products values(1700,‘wait interface’,‘Books’);
INSERT 0 1
omm=# insert into products values(1666,‘harry potter’,‘toys’);
INSERT 0 1
查询表中所有记录及记录数
omm=# select * from products;
product_id | product_name | category
------------±-------------------------------±---------------------
omm=# 1502 | olympus camera | electrncs
1601 | lamaze | toys
1700 | wait interface | Books
1666 | harry potter | toys
(4 rows)
**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 product_id ;
category
----------------------
electrncs
toys
toys
Books
(4 rows)
查询表中category为toys的记录
omm=# select category,product_id from products order by product_id ;
category | product_id
----------------------±-----------
electrncs | 1502
toys | 1601
toys | 1666
Books | 1700
(4 rows)
查询表中category为toys的记录
omm=# select * from products where category =‘toys’;
product_id | product_name | category
------------±-------------------------------±---------------------
1601 | lamaze | toys
1666 | harry potter | toys
(2 rows)
#### 删除表products
omm=# \d
List of relations
Schema | Name | Type | Owner | Storage
--------±---------±------±------±---------------------------------
public | products | table | omm | {orientation=row,compression=no}
(1 row)
omm=# drop table products;
DROP TABLE
omm=# \d
No relations found.
