Question

我有以下查询

WITH PersonCTE
  AS 
  (
  SELECT
    [ParentId],
    [Id],
    [Name],
    [LastDeleted],
    [LastRestored],
    [EntryTime]
  FROM [dbo].[Backup]
  WHERE [Id] = someguid
  UNION ALL
  SELECT
    c.ParentId,
    c.Id,
    c.Name,
    c.LastDeleted,
    c.LastRestored,
    c.EntryTime
  FROM [dbo].[Backup] c
  INNER JOIN PersonCTE s
    ON c.ParentId = s.Id
  )
  SELECT *
  FROM PersonCTE

之后需要进行此类更新：

  UPDATE Backup
  SET [LastRestored] = GETDATE

我希望能够仅为受影响结果的行设置LastRestored到GETDATE。

Answer 1

SQL Server允许您在cte上运行更新，请参见下面的示例

DECLARE @t TABLE(id INT , today DATE NULL)

INSERT INTO @t (id,today)
VALUES(1,NULL),(2,NULL)

;WITH cte AS
(
SELECT * FROM @T  WHERE today IS NULL
)
UPDATE cte SET today = GETDATE()

SELECT * FROM @t


-- in your query try this 

WITH PersonCTE
  AS 
  (
  SELECT
    [ParentId],
    [Id],
    [Name],
    [LastDeleted],
    [LastRestored],
    [EntryTime]
  FROM [dbo].[Backup]
  WHERE [Id] = someguid
  UNION ALL
  SELECT
    c.ParentId,
    c.Id,
    c.Name,
    c.LastDeleted,
    c.LastRestored,
    c.EntryTime
  FROM [dbo].[Backup] c
  INNER JOIN PersonCTE s
    ON c.ParentId = s.Id
  )
update  PersonCTE

 SET [LastRestored] = GETDATE()

SQL Server递归查询更新

1 个答案: