基于此问题，我如何计算给定日期的星期数？，我编写了以下Oracle逻辑：
CASE --if [date field]'s day-of-week (e.g. Monday) is earlier than 1/1/YYYY's day-of-week WHEN to_char(to_date('01/01/' || to_char([date field],'YYYY'),'mm/dd/yyyy'), 'D') - to_char([date field], 'D') > 1 THEN --adjust the week trunc(to_char([date field], 'DDD') / 7) + 1 + 1 --'+ 1 + 1' used for clarity ELSE trunc(to_char([date field], 'DDD') / 7) + 1END calendar_week
