TSQL - The MERGE statement attempted to UPDATE or DELETE the same row more than once. This happens when a target row matches more than one source row. A MERGE statement cannot UPDATE/DELETE the same row of the target table multiple times

..." failed with the following error: "The MERGE statement attempted to UPDATE or DELETE the same row more than once. This happens when a target row matches more than one source row. A MERGE statement cannot UPDATE/DELETE the same row of the target table multiple times. Refine the ON clause to ensure a target row matches at most one source row, or use the GROUP BY clause to group the source rows.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.
Description:
The reason for this error is source contains duplicate rows.so for a row in target matches to all the duplicates in source. Its better to avoid duplicates in source and target.
Solution:
The solution for this problem is to make sure source doesn’t contain any duplicate rows.
Note: it doesn’t fail if you have duplicate rows in target

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