SQL触发器根据特定字段的更新在第二个table中插入记录

MSQL trigger to insert record in second table based on update of specific field

我需要在 Microsoft SQL 服务器中编写一个简单的触发器。涉及两个表(语法不规范请见谅):

customer {
  customerno (integer)
  comm_preference (varchar(1))
  email (varchar(255))
  }

email_sent {
  customerno (integer)
  email (varchar(255))
  date (datetime)
}

customer.comm_preference 的有效值为 M、E、B(手机、电子邮件、两者)。我需要一个触发器,如果​​值更改为 E 或 B,则将带有 customer.customerno、customer.email 和今天日期的记录插入 email_sent。

到目前为止,我的努力已经白费了。有人可以帮助我吗?

试试这个,它会在 email_sent table 中插入一条新记录,同时记录插入 'E' 或 'B' 或值更改为 'E' 或'B'

CREATE TRIGGER dbo.trg
   ON  customer
   AFTER INSERT,UPDATE
AS 
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    IF EXISTS (SELECT  1 FROM inserted WHERE comm_preference IN ('E', 'B')
        BEGIN
            INSERT INTO email_sent 
            SELECT customerno, email, GETDATE() from inserted
        END        

END

尝试这样的事情;

CREATE TRIGGER trgCustomer_Update ON dbo.customer FOR UPDATE
AS
    BEGIN
        IF UPDATE(comm_preference)
            BEGIN
                INSERT  dbo.email_sent
                        ( customerno
                        ,email
                        ,date
                        )
                        SELECT  i.customerno
                               ,i.email
                               ,GETDATE()
                        FROM    inserted i
                        INNER JOIN deleted d
                        ON      i.customerno = d.customerno
                        WHERE   d.comm_preference NOT IN ( 'E', 'B' ) AND
                                i.comm_preference IN ( 'E', 'B' )
            END
    END
GO

此致,

里斯