苹果SQL

目录：

1.启动pgsl数据库

2.查看pgsql版本

1.启动pgsl数据库

[postgres@master ~]$ pg_ctl start
[postgres@master data]$ pg_ctl -D /usr/local/pgsql/data  start

2.查看pgsql版本

[postgres@master ~]$ pg_ctl --version

3.命令行登录数据库

psql -U username -d dbname -h hostip -p port
[postgres@master ~]$ psql -U zhang -d mydb -h 127.0.0.1  -p 5432
psql (10.5)
Type "help" for help.
mydb=>

4.列出所有数据库

[postgres@master ~]$ psql -U zhang -d mydb -h 127.0.0.1  -p 5432
psql (10.5)
Type "help" for help.
mydb=> \l
                                  List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges   
-----------+----------+----------+-------------+-------------+-----------------------
 mydb      | postgres | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 | 
 postgres  | postgres | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 | 
 template0 | postgres | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
 template1 | postgres | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
 test      | postgres | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 | 
(5 rows)

5.切换数据库

mydb=> \c test
You are now connected to database "test" as user "zhang".

6.指定表的所有字段

mydb=> \d employees
             Table "public.employees"
 Column |  Type   | Collation | Nullable | Default 
--------+---------+-----------+----------+---------
 id     | integer |           |          | 
 age    | integer |           |          | 
mydb=>