Postgres and Open Source Experts

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.

In PostgreSQL, the “CURRENT_SCHEMA” and “CURRENT_SCHEMAS” functions are used to get the details of the current schema.

In PostgreSQL, the ISEMPTY() is an in-built range function that accepts a range or multi-range as an argument and retrieves a TRUE or FALSE value.

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.