Postgres and Open Source Experts

The DENSE_RANK() function assigns a rank to each row of a partition based on the specified sorting order. It starts ranking from 1 for the first row and increases the rank for each subsequent row.

PostgreSQL supports various commands to create a database from the command line, including “createdb” and “CREATE DATABASE”.

The NTILE function is used to divide the rows of the table into groups provided by the users in the argument of the function called buckets in PostgreSQL.

The JSON_ARRAY_ELEMENTS() is a built-in JSON function that accepts a JSON array as an argument and expands its top-level elements into a set of values.

To execute PostgreSQL Query in Docker container, run Postgres container and interact with it. Then, connect to database server and execute PostgreSQL commands.

In PostgreSQL, the UPPER_INC() function accepts a range or multi-range as an argument and checks if the upper bound of the specified range is included in the range or not.

In PostgreSQL, a built-in function named “JSON_ARRAY_LENGTH()” is used to determine the length of a JSON array.

PostgreSQL offers a built-in “pg_postmaster_start_time()” function that provides the exact timestamp when the server was initiated.

In PostgreSQL, the JSON_ARRAY_ELEMENTS() and the JSON_ARRAY_ELEMENTS_TEXT() functions are used to expand the top-level elements of the given JSON array into a set of values

The LEAD is a PostgreSQL function that can be used to get the values from the following row of the table using its parameters like expression, offset, etc.