![]() ![]() The command after these creates a location column and create a constraint that requires the value to be one of eight possible values. The next two commands create columns for the equipment type and color respectively, each of which cannot be empty. This is because some column types don't require a set length because the length is implied by the type. You’ve also given this column the constraint of primary key which means that the values must be unique and not null.įor two of the columns (equip_id and install_date), the commands do not specify a field length. This data type is an auto-incrementing integer. This starts with an equipment ID, which is of the serial type. These commands will create a table that inventories playground equipment. Location varchar(25) check (location in ('north', 'south', 'west', 'east', 'northeast', 'southeast', 'southwest', 'northwest')), You can also optionally add table constraints for each column.įor demonstration purposes, create a simple table like this: CREATE TABLE playground ( These commands give the table a name, and then define the columns as well as the column type and the max length of the field data. The basic syntax for this command is as follows: CREATE TABLE table_name (Ĭolumn_name1 col_type (field_length) column_constraints, As an example, a table that describes some playground equipment. Now you can learn some basic Postgres management tasks.įirst, create a table to store some data. This is useful if you are connecting to non-default databases or with non-default users. Socket in /var/run/postgresql at port 5432. createdb database_nameįor this, we will create a new Linux system user by using adduser.įor simplicity purpose, we will be using the same name as which we created the postgres role with, adam.You are connected to database database_1 as user ana via Run the below command as a postgres user account. Shall the new role be a superuser? (y/n) yĬreating a database is as simple as it gets. Now let us see how we can create additional users that can interact with the Databases.įor this, you have to be a postgres user and then run the command as shown below, createuser -interactive To exit the postgres shell, use the below command, \q You can access a PostgreSQL prompt using the psql utility psql We'll switch to the Postgres user account for the next steps, to switch to the Postgres account, use the following command, sudo -i -u postgres Postgresql-common postgresql-contrib ssl-cert sysstat Postgresql-15 postgresql-client-15 postgresql-client-common Libsensors-config libsensors5 libtypes-serialiser-perl postgresql The following NEW packages will be installed: Lm-sensors postgresql-doc postgresql-doc-15 isag Postgresql-client-15 postgresql-client-common postgresql-common ssl-cert ![]() Libsensors-config libsensors5 libtypes-serialiser-perl postgresql-15 Libcommon-sense-perl libjson-perl libjson-xs-perl libllvm15 libpq5 The following additional packages will be installed: ![]() Output: apt install postgresql postgresql-contrib Install PostgreSQL on Ubuntu by using the following command apt updateĪpt install postgresql postgresql-contrib PostgreSQL is a powerful, open-source object-relational database system with over 30 years of active development that has earned it a strong reputation for reliability, feature robustness, and performance. ![]() How to Install PostgreSQL on Ubuntu 23.04 ![]()
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