A method and a system import data into a table. The method includes providing the table with data identities and a primary key assigned to each of the data identities. A temporary copy of the table is provided and contains a data identity to be merged into the table. The table structure of the table and of the temporary copy is determined and the determined table structure is compared to the table structure of the temporary copy to decide which data identities have to be updated and/or imported. In the temporary copy a new column contains a final primary key of the related data identity for its transfer into the table. The data identities in the table that are present in the temporary copy are locked and an update function for the data identities having the same primary key in both the table and the temporary copy are executed.