Update with except statement

问题

This is my query

SELECT PageVisit_ID,TargetSite_ID FROM [A].Datawarehouse.mi.ctb_PageEvent WITH (NOLOCK)
 EXCEPT 
 SELECT PageVisit_ID ,TargetSite_ID FROM [B].Datawarehouse.mi.ctb_PageEvent WITH (NOLOCK)

these two tables from two servers. I need to update targetsite_id in [A].Datawarehouse.mi.ctb_PageEvent records from [B].Datawarehouse.mi.ctb_PageEvent only matched with above query results.

回答1:

Try this

DECLARE @SummaryOfChanges TABLE(Change VARCHAR(20));

MERGE INTO [A].Datawarehouse.mi.ctb_PageEvent AS Target
USING ( SELECT PageVisit_ID ,TargetSite_ID FROM [B].Datawarehouse.mi.ctb_PageEvent WITH (NOLOCK)) AS SOURCE
ON Target.TargetSite_ID = Source.TargetSite_ID 
WHEN MATCHED THEN
    //UPDATE OR do nothing
WHEN NOT MATCHED BY TARGET THEN
    //INSERT 
OUTPUT $action INTO @SummaryOfChanges;

Please refer to SQL SERVER – Merge Operations – Insert, Update, Delete in Single Execution. my solution just gives a basic idea on how to do this. It might not work 100% initially. Just tweak it once you understand the logic

来源：https://stackoverflow.com/questions/12462560/update-with-except-statement