Getting the last word from a Postgres string, declaratively

Question

[EDIT] original title of this question was \"Getting the last element of a Postgres array, declaratively\"

How to obtain the last element of the array in Postgr

Answer 1

UPDATE: the question was edited, so I update my answer.

You can also use array_upper() to return the element itself (not just its index):

SELECT arr[array_upper(arr, 1)] FROM (SELECT ARRAY[1,2,3,6] AS arr) AS t

So the anwer is:

SELECT arr[array_upper(arr, 1)] FROM (SELECT string_to_array('one two three', ' ') AS arr) AS t

result: 'three'

Answer 2

You can do the following:

SELECT (ARRAY[1,8,3,7])[array_upper(ARRAY[1,8,3,7], 1)];

I.e. get the index and then select that last element.