foreach行插入到另一个表并更新列

Question

情况：具有命名表Table2Id Table1 Table2 CONSTRAINT FOREIGN KEY Table1 Table2Id

如何用来自Table2新插入的行更新Table1每一行的Table2Id列（每个Table1行将具有自己的Table2记录）？

Answer 1

我已使用以下代码在MS SQL Server上执行此操作。 我没有方便的代码，但是在MySQL中实现了类似的触发器。

ALTER TRIGGER [dbo].[Addresses_afterInsert] 
   ON  [dbo].[Addresses] 
   AFTER INSERT
AS 
BEGIN
  INSERT INTO [MultiKey] ([keyEntity], [nameEntity], [typeEntity])
  SELECT [keyAddress], [fullAddress], 'Address' AS [typeEntity]
  FROM [Addresses]
  WHERE ([keyMulti] IS NULL);
  UPDATE [Addresses]
  SET [keyMulti] = [MultiKey].[keyMulti]
  FROM [Addresses]
  INNER JOIN [MultiKey]
    ON (
      ([MultiKey].[keyEntity] = [Addresses].[keyAddress])
      AND ([MultiKey].[typeEntity] = 'Address')
    );
END