select greatest(date_trunc(‘week’, dates.d), date_trunc(‘month’,dates.d)) as start from generate_series(‘2013-02-01’::date, ‘2013-02-28’, ‘1 day’) as dates(d) group by 1 order by 1
生成给定月份的一系列周间隔
生成给定月份的一系列周间隔
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