What is a necessary condition for merging updated data into a DataSet?

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The schemas of both DataSets need to be identical to perform a mergeThe target DataSet should be cleared before merging dataEach DataTable must have a primary key definedThe DataSet can only be merged back into the original DataSet it was created from

Explanation

For merging data into a DataSet to work correctly, each DataTable involved must have a primary key defined. This key is essential for identifying rows to update or insert. Matching schemas, an empty destination DataSet, or merging only into the original DataSet are not mandatory requirements.