Postgres and Open Source Experts

Array operators are used to perform different operations on arrays. These operators are used for comparison, containment, overlapping, and concatenation.

To find the factorial of a number in PostgreSQL, we use the FACTORIAL() function that takes a number as an input and returns the value of its factorial.

ENUM_RANGE() is a built-in function in Postgres to manipulate the data having Enum data type. This function returns an array containing all the enumerators for the enum type in the same order as defined.

Enums are useful data types in Postgres that make it much easier to query, sort, and maintain the data and eventually improve data integrity.

To use Postgres image in Docker, run Postgres container using this image. For Docker compose file, define services in compose file and run Postgres container.

LAST_VALUE() is one of the Window functions in Postgres that retrieves the last value in the sorted partition/window of a result set.

JSONB_SET() accepts a new value, a JSONB value, and a path as arguments, and inserts the new value at the specified path within the targeted JSONB value.

FIRST_VALUE() is one of the Window functions in Postgres that retrieves the first value in the sorted partition of a result set.

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

JSON_TYPEOF() is a built-in JSON function that accepts any valid SQL value and retrieves its data type in text format.