Question

我有一个带有外键列的表，其中包含一些NULL记录。我可以选择缺少列的记录，例如：

SELECT * FROM Outgoing WHERE Receipt_Id IS NULL

现在，对于每个记录，我想在表Receipts中插入新记录，获取插入的记录Id并将其设置为Receipt_Id的值在这个记录中。

查询中是否可以这样做？

Answer 1

看来你正在寻找inserted表

INSERT INTO Receipts (col1, col2....)
OUTPUT INSERTED.*
INTO @CreatedIds -- TEMP TABLE WHICH HOLDS RECENTLY INERTED DATA INCLUDING Receipt_Id (pk)
SELECT col1, col2.... 
FROM Outgoing 
WHERE Receipt_Id IS NULL

至，查看最近插入的记录

SELECT c.*
FROM @CreatedIds c -- Note this is a table variable that you need to manual create.

Answer 2

更新：由于您只将Receipt表用作序列表。您应该遵循使用序列的更新方法

更新答案：

您需要做的就是创建一个序列说收据而不是一列的表。然后使用序列号更新Outgoing表。

   --create table Outgoing ( id int Primary Key IDENTITY(1,1),data nvarchar(100), record_id int);
--insert into Outgoing values ('john',NULL),('jane',NULL),('jean',NULL);

create sequence dbo.receipts as int start with 1 increment by 1;

update Outgoing
set record_id= NEXT VALUE FOR dbo.receipts
where record_id is null

select * from Outgoing

`的 See working demo`

下面的旧答案

如果两个表中都有ID列，您可以根据此列将Receipt_Id更新回Outgoing表

所以你的步骤是： 1.插入记录

DECLARE @LastRID bigint SELECT @LastRID= MAX(Id) FROM Receipts INSERT INTO Receipts(<col list>) SELECT <col list> FROM Outgoing WHERE Receipt_Id IS NULL

使用CHECKSUM函数
根据从传出到收据插入的所有列的唯一性更新记录
update O set O.Receipt_Id=R.Id From Outgoing O Join Receipts R on CHECKSUM(o.<col list>)=CHECKSUM(R.<col list>) and R.Id>@LastRID

更新表并插入缺少的记录

2 个答案:

`的 See working demo`