将Union对象转换为间隔列表

Question

如何将Sympy中的Union对象转换为子间隔列表？

E.g。转换这个：

(-oo, a] U [b, oo)

到此：

[(-oo,a], [b,oo)]

Answer 1

SELECT EMP_ID, DateName(weekday, Cast(schedule.DATE AS date)), SUM(duration) as TotalHrs 
FROM pl00.DBO.schedule
where (schedule.DATE  = CONVERT(char(10), getdate()+2, 121) -- ?
and schedule.TYPE <> "Z")
group by EMP_ID, Cast(schedule.DATE AS date)
HAVING SUM(duration) > 6

注意：如果 b＆lt; a ，那么间隔联合是（ - ∞，∞）