Postgres and Open Source Experts

In Postgres, the standard “information_schema”, a system catalog table named “pg_namespace”, and the “\dn” command is used to get the list of available schemas.

In Postgres, the IS NULL operator tests whether an expression/column contains a null value. It can be used with different statements, such as SELECT, UPDATE, etc.

The PostgreSQL “TIMESTAMP” or “TIMESTAMP WITHOUT TIME ZONE” data type stores a timestamp value without the time zone information.

The PostgreSQL “TIMESTAMPTZ” or “TIMESTAMP With TIME ZONE” data type is used to store a timestamp value that includes the time zone information.

The TO_TIMESTAMP() in Postgres is a built-in function for converting a string to a timestamp data type. Users can easily manipulate and analyze DateTime information using this function.

In Postgres, the IS NOT NULL operator tests whether an expression or a column contains a non-null value. It is used in a SELECT statement to return only non-null records from a column.

Use the “connect()” method of “psycopg” module to establish a connection with the Postgres database using python. Next, create a cursor object and execute the INSERT query via the cursor object.

The Secure Shell Protocol (SSH) provides IT professionals with a secure method to remotely connect to client environments. SSH typically uses a password or public-key method to encrypt connections and authenticate network devices. This tutorial will focus on establishing an SSH connection for data transfer between the postgres users on two Ubuntu 22.04 LTS instances.

In PostgreSQL, the UPPER(), LOWER(), and INITCAP() functions are used for letter case conversion.

The SPLIT_PART() function accepts three arguments: a string, a delimiter/separator, and a position. Consequently, it retrieves the extracted data from the given string.