MERGE EventHistory AS EH
USING (select distinct ParcelId, accountno,ImagedDateTime, CreatedDateTime,DelDateTime
from parcel
where AccountNo = ’072049′
AND CreatedDateTime > getdate() -1000
AND (ImagedDateTime is Not Null or DeldateTime is Not Null))AS PT
ON PT.ParcelId = EH.ParcelId
WHEN MATCHED THEN
UPDATE SET EH.ImagedDateTime = PT.ImagedDateTime , EH.DelDateTime = PT.DelDateTime
WHEN NOT MATCHED THEN
INSERT(ParcelId,DelDateTime,CODSentDateTime,ImagedDateTime,PODSentDateTime,LastSentDateTime)
VALUES(PT.ParcelId,PT.DelDateTime,NULL,PT.ImagedDateTime,NULL,NULL)

how to resolve it. please help me.

i want some procedure where we can check whether the 2 tables are different and if yes, merge the data such that both becomes same. structure of database, tables are exactly identical.

any help in this is appreciated.

For example, Table A (TARGET) has 2 records, Table B (SOURCE) has 2 records. Table A has an auditing trigger set, anytime a record is updated, an audit table record is created. The tables have many fields and on update, there are many tables that are joined and the values are derived from other tables.

The records in both tables are identical, so when I run the merge command, the ‘WHEN MATCHED THEN’ clause is hit, the records in the TARGET table are updated, and two new records are created in the audit table.

The knee jerk reaction is to modify the trigger, but I would like to see if I can do this within the merge command.

Thank you for your time,
Edward Meshuris

MERGE StudentTotalMarks AS stm
USING (SELECT StudentID,StudentName FROM StudentDetails) AS sd
ON stm.StudentID = sd.StudentID
WHEN MATCHED AND stm.StudentMarks > 250 THEN DELETE
WHEN MATCHED THEN UPDATE SET stm.StudentMarks = stm.StudentMarks + 25
WHEN NOT MATCHED THEN
INSERT(StudentID,StudentMarks)
VALUES(sd.StudentID,25);

************************************

Msg 156, Level 15, State 1, Line 2
Incorrect syntax near the keyword ‘AS’.
Msg 156, Level 15, State 1, Line 3
Incorrect syntax near the keyword ‘AS’.

merge into TargetTable as Target
using (
select scol1, scol2, scol3, scol4 from SourceTable
) as Source
on Target.tcol1=Source.scol1
when matched then
blah blah….
when not matched by Source then
–this one is not found by source so do something
when not matched by Target then
–this one is not found by Target so do something

Remeber to test all on a QA or Test system before implementing in a prod envoronment.

but I keep getting that it cannot insert a row that already exists (my temp tables pk violated).
When I search my source table, group by count there are none that are listed more than one time that are unique accross scol1 and scol2.

select scol1, scol2, count(*) from test group by scol1, scol2 having count(*)>1 no rows returned

Am I doing the on correctly to match against both columns?

I want to update a table which is not the source/target table in “when not matched” section using update query. is that possible?

For example –

MERGE Target AS T
USING Source AS S
ON (T.EmployeeID = S.EmployeeID)
WHEN NOT MATCHED
THEN UPDATE SET T.EmployeeName = S.EmployeeName
WHEN MATCHED
THEN DELETE

One thing should include into article that we can not use alias name with column names in Insert statement :
WHEN NOT MATCHED THEN
INSERT(stm.StudentID,stm.StudentMarks)
VALUES(sd.StudentID,25);

and if we will do this we will get following error:
“The insert column list used in the MERGE statement cannot contain multi-part identifiers. Use single part identifiers instead.”

Use merge statement in stored procedure and execute the stored procedure from .net.

Swetha

This is really nice post , but please tell me how can i call the marge statement query from .net.

Thanks and Regards,
Asha Bhatt

Are source and destination database are same?

Swetha

I copied your code and tried parsing ino SQL query. But there was an error as mentioned by you.

I then replaced the single ” ‘ ” from the query by typing the same from key board. It worked fine.

When I posted the comment and copied my code from this blog ( from my previous comment) and tried parsing . I got the same error.

So, If you are copying and pasting the code, make sure to replace single apostropes by typing from the key board.

Best Regards,
Swetha