hive中獲得週一，週五等

select date_sub('2020-04-05',pmod(datediff('2020-04-05','1900-01-08'),7)) as Last_Monday; --獲得2020-02-01所在周的週一 select date_sub('2020-04-05',pmod(datediff('2020-04-05','1900-01-08'),7)-4) as Last_Mond

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