将表的关键字段从一个数据库同步到另一个数据库

Question

我有2个数据库

Test1

Test2

我在每个数据库中都有Author表，我想将AuthorId从Test1同步到Test2。

在Test2中还有另一个表格ProductAuthor，其中包含f oreign Key constraint on AuthorID in Author table。

我现在正在做的是

1. 删除外键约束

2. 更新两个表：作者和ProductAuthor

3. 添加外键约束

    --remove the foreign key constraint
   
   ALTER TABLE [dbo].[ProductAuthor] DROP CONSTRAINT [FK_ProductAuthor_Author]
   
   Update Test2.dbo.ProductAuthor set AuthorId = (
   select distinct T1A.AuthorId from Test1.dbo.Author T1A 
   INNER JOIN Test2.dbo.Author T2A ON T1A.FirstName =  T2A.firstname COLLATE Latin1_General_CI_AS and T1A.LastName =  T2A.surname COLLATE Latin1_General_CI_AS
   where T2A.AuthorId = ProductAuthor.AuthorId
   ) where ProductAuthor.AuthorId = 6793
   
   Update Test2.dbo.Author set AuthorId = (
   select Distinct T1A.AuthorId from Test1.dbo.Author T1A 
   INNER JOIN Test2.dbo.Author T2A ON T1A.FirstName =  T2A.firstname COLLATE Latin1_General_CI_AS and T1A.LastName =  T2A.surname COLLATE Latin1_General_CI_AS
   where T1A.AuthorId = 106793) where Test2.dbo.AuthorId = 6793
   
   
   --add the foreign key constraint
   ALTER TABLE [dbo].[ProductAuthor]  WITH NOCHECK ADD  CONSTRAINT [FK_ProductAuthor_Author] FOREIGN KEY([AuthorId])
   REFERENCES [dbo].[Author] ([AuthorId])
   

以上脚本更新了specific AuthorId from Test1.Author to Test2.Author and Test2.ProductAuthor

ASK：
我如何更改脚本以便它根据Test1.Author中的名字和姓氏更新Test2.Author和Test2.ProductAuthor中的所有行？

Answer 1

我认为您要做的是更新并选择此处：

How to do 3 table JOIN in UPDATE query?

你可能只需要做一个基本的连接 - 即

JOIN (SELECT * FROM db1.author WHERE ....) as db1
SET db2.author = db1.ID

试一试，看看它是否有效。