備忘録：BigQueryで月末や月初を指定するときのSQL

必要なSQLをコピればそのまんま使えます

SELECT
DATE_TRUNC(CURRENT_DATE(), MONTH),--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