在 Sql Server 中设置出现次数

Question

任何人都可以检查我的 sql 查询，当使用 select 语句时，occurrence_number 列显示正确的值。

select t.[Employee Number], t.Document_Type, t.Document_Name,
 row_number() over (partition by document_type
                          order by right(document_name, 6)
                         ) as occurrence_number
from BluePrismProcesses.dbo.PID0147_DM t

工作

当我使用更新语句时，出现次数乱了。

update BluePrismProcesses.dbo.PID0147_DM
set Occurrence = R.occurrence_number
from (select t.[Employee Number], t.Document_Type, t.Document_Name,
 row_number() over (partition by document_type
                          order by right(document_name, 6)
                         ) as occurrence_number
from BluePrismProcesses.dbo.PID0147_DM t) R
where BluePrismProcesses.dbo.PID0147_DM.Document_Name = r.Document_Name

不工作

Answer 1

问题是您有一个具有相同 document_name 的重复行，因此 where 子句无法按您预期的方式工作。

您可以使用 common table expression 并像这样直接更新该 cte 来解决这个问题：

;with cte as (
  select 
      t.[Employee Number]
    , t.Document_Type
    , t.Document_Name
    , t.occurrence
    , occurrence_number = row_number() over (
        partition by document_type 
        order by right(document_name, 6)
      )
   from BluePrismProcesses.dbo.PID0147_DM t
)

update cte
  set occurrence =  occurrence_number
where (occurrence <> occurrence_number or occurrence is null);

rextester 演示：http://rextester.com/ZVO11388

returns:

+-----------------+-----------+---------------+---------------+------------+
| Employee Number | Doc_Count | Document_Type | Document_Name | Occurrence |
+-----------------+-----------+---------------+---------------+------------+
|          406453 |         2 | offer         |        092735 |          1 |
|          406453 |         2 | offer         |        092735 |          2 |
|          406453 |         2 | offer         |        092848 |          3 |
|          406453 |         2 | offer         |        092848 |          4 |
|          406453 |         2 | offer         |        092848 |          5 |
+-----------------+-----------+---------------+---------------+------------+

在 Sql Server 中设置出现次数

Setting occurrence number in Sqlserver

sql

sql-server

find-occurrences