在線等待:請教觸發器的問題
表結構和觸發器代碼如下:
CREATE   TABLE   [dbo].[service_empl]   (
[empl_index]   [char]   (10)   COLLATE   Chinese_Taiwan_Stroke_CI_AS   NOT   NULL   ,
[empl_ensuremony]   [money]   NULL  
)   ON   [PRIMARY]
GO

ALTER   TABLE   [dbo].[service_empl]   WITH   NOCHECK   ADD  
CONSTRAINT   [service_empl]   PRIMARY   KEY     CLUSTERED  
(
[empl_index]
)     ON   [PRIMARY]  
GO

CREATE   TABLE   [dbo].[admini_ensuremoney]   (
[empl_index]   [char]   (10)   COLLATE   Chinese_Taiwan_Stroke_CI_AS   NOT   NULL   ,
[empl_oldmon]   [money]   NULL   ,
[empl_newmon]   [money]   NULL   ,
[empl_date]   [smalldatetime]   NOT   NULL  
)   ON   [PRIMARY]
GO

ALTER   TABLE   [dbo].[admini_ensuremoney]   WITH   NOCHECK   ADD  
CONSTRAINT   [PK_admin_ensuremoney]   PRIMARY   KEY     CLUSTERED  
(
[empl_index],
[empl_date]
)     ON   [PRIMARY]  
GO

ALTER   TABLE   [dbo].[admini_ensuremoney]   WITH   NOCHECK   ADD  
CONSTRAINT   [DF_admini_ensuremoney_empl_oldmon]   DEFAULT   (0)   FOR   [empl_oldmon],
CONSTRAINT   [DF_admini_ensuremoney_empl_newmon]   DEFAULT   (0)   FOR   [empl_newmon]
GO

CREATE   TRIGGER   [ensuremoney_insert]   ON   dbo.admini_ensuremoney  
FOR   INSERT,   UPDATE,   DELETE
AS
update   service_empl   set   service_ensuremoney=l.empl_oldmon     from   service_empl     y   ,   deleted   l   where   y.service_empl_index=l.empl_index
update   service_empl   set   service_ensuremoney=l.empl_newmon     from   service_empl   y   ,inserted   l   where   y.service_empl_index=l.empl_index

問題:這種方式會有一種錯誤:
當我增加,修改還是刪除admini_ensuremoney表中a君的一筆記錄時,如果這筆記錄的日期不是最新的日期,則此時也會去更新service_empl表中的值.

要求:我需要不管是增加,修改還是刪除操作,只有此筆記錄的日期是最新的日期(當前操作記錄的日期> =admini_ensuremoney中此人的最大日期)時,才去更新service_empl表中的數據
說明:名種觸發情況的代碼可分開


------解决方案--------------------
CREATE TRIGGER [ensuremoney_insert] ON dbo.admini_ensuremoney
FOR INSERT, UPDATE, DELETE
AS
update service_empl set service_ensuremoney=l.empl_oldmon from service_empl y ,deleted l where y.service_empl_index=l.empl_index And l.empl_date > = (Select Max(empl_date) From admini_ensuremoney Where service_empl_index = l.service_empl_index)

update service_empl set service_ensuremoney=l.empl_newmon from service_empl y ,inserted l where y.service_empl_index=l.empl_index And l.empl_date > = (Select Max(empl_date) From admini_ensuremoney Where service_empl_index = l.service_empl_index)

------解决方案--------------------
CREATE TRIGGER [ensuremoney_insert] ON dbo.admini_ensuremoney
FOR INSERT, UPDATE, DELETE
AS
update service_empl y
set y.service_ensuremoney=l.empl_oldmon
from service_empl y
join (
select * from deleted _d
where not exists
(select 1 from deleted where empl_index = _d.empl_index and empl_date > _d.empl_date)
and _l.empl_date > =
(select max(empl_date) from admini_ensuremoney where empl_index = _l.empl_index )
) l on y.service_empl_ind