MS SQL 2017触发器将旧值作为AFTER UPDATE的新值

Question

我使用MS SQL Management Studio 2017。我需要trigger（trigg_1）为AFTER UPDATE，它要插入column（col_1）旧值而不是新值。我将使用新值手动更改column col_1，触发器需要使用旧值更改col_1。

CREATE TRIGGER trigg_1 
   ON  table_1 
   AFTER UPDATE
AS 
BEGIN


END
GO

Answer 1

尝试一下：

CREATE TRIGGER trigg_1 
   ON  table_1 
   AFTER UPDATE
AS 
BEGIN

    UPDATE  T2
    SET     T2.COL_1 = T1.COL_1
    FROM    DELETED T1
    INNER JOIN TABLE_1 T2 ON T2.ID = T1.ID /* Here you must link by PK - I suggested PK contains only ID column. */

END
GO