为什么我的 SQL 语句给出难以理解的结果 [关闭]

Question

当我像那样使用条件时 - 一个结果，如果我使用 case-end 构造或 If 函数，那么结果是不同的并且完全不合逻辑。

...
Lead(fact_time_tz) Over Win is Null as first_cond,
(diff_date < Max(diff_date) Over(PARTITION BY r.session_uuid) OR is_last_fact = 1) as second_cond,
Lead(fact_time_tz) Over Win is Null
  AND
(diff_date < Max(diff_date) Over(PARTITION BY r.session_uuid) OR is_last_fact = 1)
AS cond,
case when 
   Lead(fact_time_tz) Over Win is Null
      AND
   (diff_date < Max(diff_date) Over(PARTITION BY r.session_uuid) OR is_last_fact = 1)
   then 1 else 0
   end as new_last_fact
   ...

需要帮助！谁能对此给出一个合乎逻辑的解释？！ 我有这个输出

is_last_fact	first_cond	second_cond	条件	new_last_fact
1	1	1	1	1
0	0	1	0	0
0	1	1	1	0
0	1	1	1	0
0	1	1	1	0
0	1	1	1	0
0	0	1	0	0