How to make unstructured array of object to row?

All we need is an easy explanation of the problem, so here it is. is jsonb object, like this: {programs:[{...},{...}]}>'programs' is jsonb array, like this [{a:1},{b:2},{c:3,d:4}] or null

Already tried this:

FROM Clients c , jsonb_array_elements(>'programs') p

or this

FROM Clients c , jsonb_array_elements(COALESCE(>'programs','[]'::JSONB)) p

but it shows an error:

[22023] ERROR: cannot extract elements from a scalar

how can I retrieve the object inside data->'programs' as rows of object?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

You can use a JSON path instead, using the jsonb_path_query function.

FROM Clients c
CROSS JOIN LATERAL jsonb_path_query(, '$.programs') p


Method 2

Nevermind, found the answer, must filter the null first

FROM Clients c, jsonb_array_elements(>'programs') p
WHERE (>>'programs') <> 'null'
-- or LENGTH(>>'programs') > 0

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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