Merging Concatenating JSON(B) columns in query

Question

Using Postgres 9.4, I am looking for a way to merge two (or more) json or jsonb columns in a query. Consider the following table as an example:

Answer 1

Try this, if anyone having an issue for merging two JSON object

select table.attributes::jsonb || json_build_object('foo',1,'bar',2)::jsonb FROM table where table.x='y';