如何创建在 table 的字段更新时自动更新日期时间列的触发器

Question

我正在尝试创建一个列来衡量一行的 UPDATE_DATE。我正在构建一个触发器，但我有一个关于密钥的歧义问题。

CREATE TRIGGER ModDate_location_update
    ON dim_Location
    AFTER UPDATE
AS
BEGIN
    UPDATE dbo.dim_Location 
    SET UPDATE_DATE = GETDATE()
    --WHERE INSERT_DATE IN (SELECT INSERT_DATE FROM INSERTED)
    FROM dim_Location X
    JOIN dim_Location Y ON X.NEW_LOCATION_KEY = Y.NEW_LOCATION_KEY
end

Msg 8154, Level 16, State 1, Procedure ModDate_location_update, Line 6 [Batch Start Line 119] The table 'dbo.dim_Location' is ambiguous.

Answer 1

只需更新具有出现在 INSERTED 虚拟 table 中的 PK 的所有行。例如：

CREATE TRIGGER ModDate_location_update
    ON dim_Location
    AFTER UPDATE
AS
BEGIN
    UPDATE dbo.dim_Location 
    SET UPDATE_DATE = GETDATE()
    WHERE LOCATION_ID IN (SELECT LOCATION_ID FROM INSERTED)
end

如何创建在 table 的字段更新时自动更新日期时间列的触发器

How to create a trigger that automatically update a datetime column when a field of the table is updated

sql-server

ssms-2017