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Athenaで先月月初、先月月末、今月月初、今月月末を出す

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Athenaで日付周りの扱いでハマったので備忘録です。
current_dateではうまく行かず。current_timestampを使うのがポイント。

-- Athena 先月、今月
SELECT 
   date_trunc('month', current_timestamp) - interval '1' month                      AS "先月月初",
   date_trunc('month', current_timestamp) - interval '1' day                        AS "先月月末",
   date_trunc('month', current_timestamp)                                           AS "今月月初",
   date_trunc('month', current_timestamp) + interval '1' month - interval '1' day   AS "今月月末"
;

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