I'm running the latest version of PostgreSQL 9.4.5-1.pgdg14.04+1
, and am attempting to calculate the length of a JSONB array using the JSON_ARRAY_LENGTH
function as described in the PostgreSQL 9.4 Documentation
Here is the exact query I'm attempting to run:
SELECT JSON_ARRAY_LENGTH('["hi","ho"]'::jsonb) AS length
When I run that query, I would expect to be returned a value of 2
, but instead am encountering the error: ERROR: function json_array_length(jsonb) does not exist
Am I missing something very obvious in the documentation? It specifically states you may call JSON_ARRAY_LENGTH
passing either a json
or jsonb
data-type. I'm explicitly casting to jsonb
so I'm at a bit of a loss.
Has anyone else encountered this problem, or would someone point out what I'm doing wrong here?
UPDATE: I Mis-Read The Documentation
I should have been calling JSONB_ARRAY_LENGTH
, not JSON_ARRAY_LENGTH
. Notice the "B" after "JSON". Thanks guys.
SELECT jsonb_array_length('["question","solved"]') AS length;
or
SELECT json_array_length('["question","solved"]') AS length;