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insert into topic (name, creation_datetime)
(select
unnested_names.name,
unnested_names.creation_datetime
from (
select
unnest(ARRAY ['win', 'holidays', 'food', 'IT']) as name,
unnest(ARRAY [now(), now(), '2021-01-01T00:00', '2021-02-02T01:30']) as creation_datetime
) as unnested_names
where not unnested_names.name in (select name from topic)
)
returning topic_id, name
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