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並前往https://www.postgresql.org/docs/9.3/functions-json.html

9.3: JSON Functions and Operators - PostgreSQL

Function Return Type Example Example Result array_to_json(anyarray ) json array_to_json(''::int) row_to_json(record ) json row_to_json(row(1,'foo')) to_json(anyelement) json to_json('Fred said "Hi."'::text) "Fred said \"Hi.\""

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