BigQueryの日付を扱う際のメモ
2022-03-25
よく使うと思われるクエリをメモしておく
SELECT
DATE_TRUNC(CURRENT_DATE(), MONTH) AS first_day, # 月初
LAST_DAY(CURRENT_DATE(), MONTH) AS last_day, # 月末
DATE_TRUNC(DATE_SUB(CURRENT_DATE(), INTERVAL 1 DAY), MONTH) AS first_day_of_yesterday, # 前日起算の月初
LAST_DAY(DATE_SUB(CURRENT_DATE(), INTERVAL 1 DAY), MONTH) AS last_day_of_yesterday, # 前日起算の月末
DATE_TRUNC(DATE_SUB(CURRENT_DATE(), INTERVAL 3 MONTH), MONTH) AS first_day_of_last_three_month # 3ヶ月前の月初DATE_TRUNC, LAST_DAYが便利
