Hello @Sambasiva ,
Welcome to the MS Q&A platform.
MERGE in Synapse will not work on tables with Identity columns. This is a known restriction of MERGE in the Synapse.
I see the below feedback request in the synapse discussion forum. I would suggest upvoting & comment on this feedback URL. This allows product teams to prioritize your idea against our existing feature backlog effectively and gives insight into the potential impact of implementing the suggested feature.
Please let me know if you have any further questions.
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