根据 row_number() 更新列

Question

我为我的表创建了一个默认值为 0 的新非空列，它保持显示顺序。我想更新该表的所有行，该 displayorder 的值 row_number() 超过 id 排序。在这里，我可以为一个 id 做到这一点。我怎样才能为所有 id 做到这一点。

我的桌子是：

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

我想要的结果是：

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

这个使用了公共表表达式在 SQL Server 中被视为可更新视图这一事实。

甚至可以使用row_number() 作为显示顺序创建视图，这样会自动重新计算，因此您不必每次添加/删除行时都更新表格。

Answer 3

一个快速的解决方案是使用排名工具。该示例应该满足您的要求。

DECLARE @Pid TABLE
(
    Id INT,
    PersonId INT,
    Name NVARCHAR(25),
    DisplayOrder INT
)

INSERT INTO @Pid
VALUES
(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 )

UPDATE pid
SET DisplayOrder = dpid.rank
FROM @Pid pid
INNER JOIN 
(
    SELECT *, Rank() OVER(Partition by PersonId Order by Id) as rank
    FROM @Pid
 )dpid ON dpid.Id = pid.Id

 SELECT * 
 FROM @Pid