I want to merge two tables without any primary keys - sql-server

Question

We cannot create any additional column
Please keep that in mind
The whole intention of this script is to merge data into my temp table
when the data is matching don't have to do any thing.
if some data is present in #temp_cqm_class_template_xref and not in cqm_class_template_xref_temp then those data's has to be deleted from #temp_cqm_class_template_xref table
if it is the other way it has to be inserted into the #temp_cqm_class_template_xref table
IF OBJECT_ID('tempdb..#temp_cqm_class_template_xref') IS NOT NULL
DROP TABLE #temp_cqm_class_template_xref;
CREATE TABLE #temp_cqm_class_template_xref (
[template_name] [VARCHAR](30) NOT NULL
,[measure_id] [INT] NOT NULL
,[cqm_item_mstr_id] [INT] NOT NULL
,[created_by] [INT] NOT NULL
,[modified_by] [INT] NOT NULL
,[create_timestamp] [DATETIME] NOT NULL
,[modify_timestamp] [DATETIME] NOT NULL
);
MERGE INTO #temp_cqm_class_template_xref AS t
USING cqm_class_template_xref_temp AS s
ON (
t.template_name = s.template_name
AND t.measure_id = s.measure_id
AND t.cqm_item_mstr_id = s.cqm_item_mstr_id
)
WHEN NOT MATCHED
THEN
INSERT (
template_name
,measure_id
,cqm_item_mstr_id
,created_by
,modified_by
,create_timestamp
,modify_timestamp
)
VALUES (
s.template_name
,s.measure_id
,s.cqm_item_mstr_id
,s.created_by
,s.modified_by
,s.create_timestamp
,s.modify_timestamp
)
WHEN NOT MATCHED BY target
THEN
DELETE;
When I run this script, I get the following error:
Msg 10711, Level 15, State 1, Procedure
ngdev_cqm_class_template_xref_bcp_upld, Line 88 An action of type
'INSERT' is not allowed in the 'WHEN MATCHED' clause of a MERGE
statement

Answer 1

Merge is not a good technique to use. see:
https://www.mssqltips.com/sqlservertip/3074/use-caution-with-sql-servers-merge-statement/
Merge is hard to debug and very hard to maintain later when you have problems with the data that it is trying to merge. Don't ever use it.
Instead write an insert using a select instead of a values clause and write a delete.

Answer 2

You may try something like left join and figure out what columns are null
in the opposite table;
According to your logic This might help you
update t
set t.template_name=null,
t.measure_id = null,
t.cqm_item_mstr_id = null
#temp_cqm_class_template_xref t Left join cqm_class_template_xref_temp s on
t.template_name = s.template_name
AND t.measure_id = s.measure_id
AND t.cqm_item_mstr_id = s.cqm_item_mstr_id
delete from #temp_cqm_class_template_xref
where measure_id is null and cqm_item_mstr_id is null and and template_name is null