Postgresql extract multiple values into different columns

Question

I need your help with a survey. The raw table is in the following format:

I need to convert the information into columns however in some cases there can be multiple values for an answer.

The desired output would be the following:

I managed to concatenate the answers into a list with the following code:

'{' || ARRAY_TO_STRING(ARRAY_AGG('"' || Question || '":' || Answer),',') || '}' AS key_value

Then using this column I could extract it with:

CAST(COALESCE(key_value::JSON ->> 'consumption_soda','0') AS INTEGER) AS soda_consumption,
CAST(COALESCE(key_value::JSON ->> 'consumption_water','0') AS INTEGER) AS water_consumption

However, when I wanted to extract soda_painpoints it will only return the first value. Could you please help me find an answer to my problem?

Answer 1

First, to concatenate the answers into a jsonb object, you should use jsonb_object_agg(Question, Answer) AS key_value instead of '{' || ARRAY_TO_STRING(ARRAY_AGG('"' || Question || '":' || Answer),',') || '}' AS key_value '{' || ARRAY_TO_STRING(ARRAY_AGG('"' || Question || '":' || Answer),',') || '}' AS key_value '{' || ARRAY_TO_STRING(ARRAY_AGG('"' || Question || '":' || Answer),',') || '}' AS key_value .

Then the Answer '1 5 8 7' for the soda_painpoints Question seems to be a string which concatenates a list of integers (1, 5, 8, 7) separated by a space character. In this case, you can store the Answer as a simple jsonb numeric value or as a jsonb array depending on the type of the Answer value :

SELECT jsonb_object_agg( Question
                       , CASE 
                           WHEN jsonb_typeof(to_jsonb(Answer)) = 'number'
                           THEN Answer :: integer
                           ELSE regexp_split_to_array(Answer, '\s+') :: integer[]
                         END
                       ) AS key_value

Doing so, the value associated to the key soda_painpoints will be a jsonb array of integers.