Question

我在DetailsTbl：

中按如下方式存储了时间表表记录

ID   |  Day        | hours
----------------------------
 1   | 14/feb/14   |   8
 1   | 15/feb/14   |   8

表格PAssign如下：

 ID | from      | to
----------------------------------
 1  | 14/feb/14 | 17/feb/14

通过执行存储过程，输出应显示：

ID | from      | to        | day       | Hours
------------------------------------------------
 1 | 14/feb/14 | 17/feb/14 | 14/feb/14 |  8
 1 | 14/feb/14 | 17/feb/14 | 15/feb/14 |  8
 1 | 14/feb/14 | 17/feb/14 | 16/feb/14 |  0
 1 | 14/feb/14 | 17/feb/14 | 17/feb/14 |  0

只有从 / 到之间的天的空值应设置为默认值<＆39; 0 ＆＃39;

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Answer 1

可以使用recursive CTE或Numbers table获取范围并将其展开为多个记录。以下是使用递归CTE的示例：

;with cte as (
  select [id], [from], [to], [from] as day from PAssign
  union all
  select [id], [from], [to], [day]+1 from cte
  where [day] < [to]
)
select
  cte.id, cte.[from], cte.[to], cte.[day],
  coalesce(d.hours, 0) as hours
from cte
left join DetailsTbl d on cte.id = d.id and cte.day = d.day

结果（DEMO）

| ID |                            FROM |                              TO |                             DAY | HOURS |
|----|---------------------------------|---------------------------------|---------------------------------|-------|
|  1 | February, 14 2014 00:00:00+0000 | February, 17 2014 00:00:00+0000 | February, 14 2014 00:00:00+0000 |     8 |
|  1 | February, 14 2014 00:00:00+0000 | February, 17 2014 00:00:00+0000 | February, 15 2014 00:00:00+0000 |     8 |
|  1 | February, 14 2014 00:00:00+0000 | February, 17 2014 00:00:00+0000 | February, 16 2014 00:00:00+0000 |     0 |
|  1 | February, 14 2014 00:00:00+0000 | February, 17 2014 00:00:00+0000 | February, 17 2014 00:00:00+0000 |     0 |

将其转换为存储过程应该非常简单。另请注意，递归CTE使用每个记录生成的一级递归，因此您需要根据需要设置maximum recursion level。

SQL Server存储过程返回不存在的临时记录

1 个答案: