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with cte(data) as ( select '{"a": "1", "b": "1"}'::json union all select '{"a": "2", "b": "1"}'::json ) select key , array_agg(distinct value ) from cte left join lateral (select * from json_each_text(data)) j on true group by key
key
array_agg
a
{1,2}
b
{1}
SELECT 2