Well, the error says it all. There are obviously 2 customers with the value 105 in the ACCOUNT field in the 'CSV' table. You need to either remove the Primary key restraint on dbo.customer (not recommended) or remove one of the customers in the 'CSV' table with ACCOUNT 105.
When I was a coder, we worked on algorithms. Today, we memorize APIs for countless libraries — those libraries have the algorithms - Eric Allman
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