寻找失踪号码顺序int类型的SQL Server

Question

假设我有此表

BookNo. | page 
001  | 01 
001  | 02 
001  | 04 
002  | 01 
002  | 03 
003  | 01 
003  | 02 

是否有可能得到与缺页号码booknos？

Answer 1

这将工作，除了第1页缺失（写在甲骨文这样的语法可能会稍有不同）：

with cte1 as (
select distinct 
    BookNo 
    ,case when a.page + 1 != lead(page) over (partition by bookno order by page) then page + 1 end as missing_start 
    ,case when a.page + 1 != lead(page) over (partition by bookno order by page) then lead(page) over (partition by bookno order by page) - 1 end as missing_end 
from test a 
where 1=1 
) 
select * 
from cte1 
where missing_start is not null 
order by 1 
; 

结果：

| BOOKNO | MISSING_START | MISSING_END | 
|--------|---------------|-------------| 
| 001 | 3    | 3   | 
| 002 | 2    | 2   |