基于row_number()更新列

Question

我为我的表创建了一个新的非空列,默认值为0,它保持显示顺序.我想更新该表的所有行,displayorder的id值为row_number().在这里我可以为一个id做这个.我怎么能为所有的ID做到这一点.

我的表是:

id | personid | name   | displayorder
---+----------+--------+------------
 1 |    10    | test1  |    0
 2 |    10    | test2  |    0
 3 |    10    | test3  |    0
 4 |    10    | test4  |    0
 5 |    10    | test5  |    0
 6 |    11    | test6  |    0
 7 |    11    | test7  |    0
 8 |    12    | test8  |    0

我想结果是:

id | personid | name   | displayorder
---+----------+--------+------------
 1 |    10    | test1  |    1
 2 |    10    | test2  |    2
 3 |    10    | test3  |    3
 4 |    10    | test4  |    4
 5 |    10    | test5  |    5
 6 |    11    | test6  |    1
 7 |    11    | test7  |    2
 8 |    12    | test8  |    1

这是我的sql代码,但它只适用于一个给定的id:

update MyTable
set displayorder = z.ord
 FROM  (
   SELECT row_number() over (order by id) as ord, id 
     FROM MyTable p2
   where p2.personid = 1
   ) z
  where MyTable.id= z.id
  and personid = 1

Answer 1

使用此代码:

 Create  TABLE #order
    (
        Id INT,
        PersonId INT,
        Name NVARCHAR(25),
        DisplayOrder INT
    )

    INSERT INTO #ORDER VALUES(1 , 10 , 'test1',0 )
    INSERT INTO #ORDER VALUES(2 , 10 , 'test2',0 )
    INSERT INTO #ORDER VALUES(3 , 10 , 'test3',0 )
    INSERT INTO #ORDER VALUES(4 , 10 , 'test4',0 )
    INSERT INTO #ORDER VALUES(5 , 10 , 'test5',0 )
    INSERT INTO #ORDER VALUES(6 , 11 , 'test6',0 )
    INSERT INTO #ORDER VALUES(7 , 11 , 'test7',0 )
    INSERT INTO #ORDER VALUES(8 , 12 , 'test8',0 )



 update #order 
    Set #order.DisplayOrder=R.DisplayOrder
    from(select id,ROW_NUMBER() over (partition by S.personid  order by S.id) as DisplayOrder
    from #order S) R
    where #order.Id=R.id

    select * from #order

Answer 2

如果productproperty和MyTable真的是同一张桌子，我会这样做：

with cte as (
    select
        t.displayorder,
        row_number() over(partition by t.PersonId order by t.Id) as rn
    from MyTable as t
)
update cte set displayorder = rn

这个使用了这样一个事实，即公共表表达式在 SQL Server 中被视为可更新的视图。

或者甚至使用row_number()as displayorder创建视图，因此它将自动重新计算，因此您不必每次添加/删除行时都更新表。