PostgreSQL: Show tables in PostgreSQL – Dev

The best answers to the question “PostgreSQL: Show tables in PostgreSQL” in the category Dev.

QUESTION:

What’s the equivalent to show tables (from MySQL) in PostgreSQL?

ANSWER:

Login as superuser:

sudo -u postgres psql

You can list all databases and users by \l command, (list other commands by \?).

Now if you want to see other databases you can change user/database by \c command like \c template1, \c postgres postgres and use \d, \dt or \dS to see tables/views/etc.

ANSWER:

From the psql command line interface,

First, choose your database

\c database_name

Then, this shows all tables in the current schema:

\dt

Programmatically (or from the psql interface too, of course):

SELECT * FROM pg_catalog.pg_tables;

The system tables live in the pg_catalog database.

ANSWER:

(For completeness)

You could also query the (SQL-standard) information schema:

SELECT
    table_schema || '.' || table_name
FROM
    information_schema.tables
WHERE
    table_type="BASE TABLE"
AND
    table_schema NOT IN ('pg_catalog', 'information_schema');

ANSWER:

You can use PostgreSQL’s interactive terminal Psql to show tables in PostgreSQL.

1. Start Psql

Usually you can run the following command to enter into psql:

psql DBNAME USERNAME

For example, psql template1 postgres

One situation you might have is: suppose you login as root, and you don’t remember the database name. You can just enter first into Psql by running:

sudo -u postgres psql

In some systems, sudo command is not available, you can instead run either command below:

psql -U postgres
psql --username=postgres

2. Show tables

Now in Psql you could run commands such as:

  1. \? list all the commands
  2. \l list databases
  3. \conninfo display information about current connection
  4. \c [DBNAME] connect to new database, e.g., \c template1
  5. \dt list tables of the public schema
  6. \dt <schema-name>.* list tables of certain schema, e.g., \dt public.*
  7. \dt *.* list tables of all schemas
  8. Then you can run SQL statements, e.g., SELECT * FROM my_table;(Note: a statement must be terminated with semicolon ;)
  9. \q quit psql