2

I have a json column called "Parameters" in a "Assets" table. The jsons are nested and have the following structure:

{
"params1": {"k": 1.1, "efficiency": 0.7}, 
"params2": {"k": 1.9, "C_max": 100.0, "C_min": 10.0}
}

I would like to update only one value "k" in "params2" and keep the rest of the values unchanged. I tried with the following code:

update "Assets" 
set "Parameters" = "Parameters"::jsonb || '{"params2":{"k":2.2}}'::jsonb
where "Id" = 185;

This results in

{
"params1": {"k": 1.1, "efficiency": 0.7}, 
"params2": {"k": 2.2}
}

So the rest of the parameters in "params2" are dropped which is not desired. What would be a way to modify "k" and leave the rest as it is?

0
4

You are looking for jsonb_set()

update "Assets" 
  set "Parameters" = jsonb_set("Parameters"::jsonb, '{params2, k}', to_jsonb(2.2))
where ...
0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.