回答編集履歴
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サンプル追記
test
CHANGED
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@@ -5,3 +5,65 @@
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[PostgreSQLでCSVからUpdateをかける](https://qiita.com/kuwana/items/851125828a20d23cca1b)
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[PostgreSQLのUPSERT方式の簡易性能比較](https://qiita.com/fujii_masao/items/6e9417f78dc0cbd0e13d)
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追記
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--
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サンプル追記
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```SQL
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-- Create tmp table
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create temp table tmp (id int, day date,value varchar(20)) on commit drop;
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-- Import data from csv:
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copy tmp from 'C:/test.csv' delimiter ',' csv header;
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-- IDが重複しているもののうち最新の日付以外を削除
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delete from tmp as target where day < (select max(day) from tmp where id=target.id);
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-- Update table from tmp
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update import_test_tbl set
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id = tmp.id
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, date = tmp.day
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, value = tmp.value
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from tmp
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where import_test_tbl.id = tmp.id
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;
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-- Insert table from tmp
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insert into import_test_tbl
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select id, day, value
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from tmp
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where not exists( --キーが存在していないもの
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select 1 from import_test_tbl where id = tmp.id
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)
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;
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```
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