Question

I’m a postgreSQL newbie and I can’t find any usable introduction to using the psql command. At least I think that’s the command I want to use.

Is it possible in postgreSQL to simply connect to the server and then list, create, use and examine databases?

I’d like to be able to use psql to do something like this with MySQL (I’ve deleted many extra lines):

Connect without specifying a database – I can’t seem to do that with psql:

$ mysql -u root -prootpassword
Welcome to the MySQL monitor.  Commands end with ; or \g.
Server version: 5.5.28 MySQL Community Server (GPL)

I can list databases with mysql but the posgreSQL command SHOW doesn’t seem to do it.

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| ocdp               |
| performance_schema |
| test               |
+--------------------+
5 rows in set (0.04 sec)

I can switch databases.

mysql> use ocdp;
Database changed

I can’t figure out this command in psql:

mysql> show tables;
+---------------------------------+
| Tables_in_ocdp                  |
+---------------------------------+
| OCAddresses                     |
| OCStreets                       |
+---------------------------------+
2 rows in set (0.00 sec)

I think I can do this in psql with ‘createdb’ and ‘dropdb’ commands:

mysql> create database foo;
Query OK, 1 row affected (0.00 sec)

mysql> drop database foo;
Query OK, 0 rows affected (0.03 sec)

I use \quit

mysql> quit
Bye

The answer to these questions should take only a moment for someone who knows postgreSQL but I just can’t find documentation anywhere that shows how to do these simple operations. Maybe I shouldn’t even be using psql at all for this?

Answer 1

connect to server:

$ mysql -u root -prootpassword

$ su - postgres
$ psql

list databases:

mysql> show databases;

postgres=# \l

switch databases:

mysql> use ocdp;

postgres=# \c ocdp

show tables:

mysql> show tables;

postgres=# \dt

create database:

mysql> create database foo;

postgres=# create database foo;

drop database:

mysql> drop database foo;

postgres=# drop database foo;

quit:

mysql> quit

postgres=# \q