SQL Server的更新，如果记录不表B中发现

Question

有如下表：

表名PLANS

字段名称

Key EMP _ID 
Key PLAN_NUMBER 
STATUS 
FIELD1 
FIELD2 
FIELD3 
FIELD4 

表名PLANS_TEMP

Key EMP_ID 
Key PLAN_NUMBER 
STATUS 
FIELD1 
FIELD2 
FIELD3 
FIELD4 

想要在有数据表。

不想删除的记录，而不是要设置状态=“我”如果PLANS_TEMP

1. 不存在记录，如果记录不存在Office_Plan_temp要更新Office_Plan.Status ='我

喜欢的东西如下：

Update P 
Set status = ‘I’ 
Where emp_id and plan_number not exists in Plans_Temp table 

（我们必须匹配LOCATION_ID & PLAN_NUMBER）

1. 如果记录在Plans_Temp表中找到，但不在Plans表中，则要插入。

2. 对于所有现有的记录，想检查field1，field2，field3和field4是否有任何变化，然后更新。

任何帮助将不胜感激。

Answer 1

像这样的东西可以帮助你：

MERGE PLANS as target 
USING PLANS_TEMP as source 
ON target.EMP_ID = source.EMP_ID AND target.PLAN_NUMBER = source.PLAN_NUMBER 
--If record doesn’t exists in Office_Plan_temp Wants to update Office_Plan.Status = ‘I’ 
WHEN NOT MATCHED BY SOURCE THEN 
    UPDATE SET [STATUS] = 'I' 
--If Record found in Plans_Temp table but not in Plans table, wants to insert. 
WHEN NOT MATCHED BY TARGET THEN 
    INSERT (EMP_ID, PLAN_NUMBER, [STATUS], FIELD1, FIELD2, FIELD3, FIELD4) 
    VALUES (source.EMP_ID, source.PLAN_NUMBER, source.[STATUS], source.FIELD1, source.FIELD2, source.FIELD3, source.FIELD4) 
--For all the existing records, (! HERE UPDATE WITHOUT ANY CHECKING wants to check if there’s any change in) field1, field2, field3 and field4 then update. 
WHEN MATCHED THEN 
    UPDATE SET target.FIELD1 = source.FIELD1, 
       target.FIELD2 = source.FIELD2, 
       target.FIELD3 = source.FIELD2, 
       target.FIELD4 = source.FIELD4;