Postgres and Open Source Experts

In PostgreSQL, the UNNEST() function is used with a valid multirange type such as “int4multirange”, “tstzmultirange”, etc., to expand multi-range values into a set of range values

In PostgreSQL, the LOWER_INC() function accepts a range or multi-range as an argument and checks if the lower bound of the specified range is inclusive or exclusive.

PostgreSQL supports various built-in array functions, such as ARRAY_PREPEND(), ARRAY_CAT(), etc., to deal with the array's data efficiently.

The LAG() function in PostgreSQL is an SQL function that can be used to get the values from the previous row of the table using its parameters.

In Postgres, a couple of built-in methods, such as CURRENT_CATALOG, and CURRENT_DATABASE are used to get the names of the current database.

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

To run PostgreSQL and pgAdmin using Docker, download Postgres and pgAdmin4 images from Docker Hub. Then, build and start the Postgres and pgAdmin4 containers.

The NTH_VALUE function in PostgreSQL is used to get the Nth_value from the table using the column and offset to set the value from the column.

To install PostgreSQL using Docker Compose, specify the desired services in compose file. Then, start the compose service to build and run Postgres container.

In PostgreSQL, the “CURRENT_USER”, “CURRENT_ROLE”, and “USER” methods are used to get the details of the current user.