How to Check for Duplicates Before Inserting Into SQL. When you insert new records into an SQL database, you may run into issues where you accidentally overwrite records that are already present ...

As you can see in Figure E, the Find Duplicates column returns the value 2 if the record has a duplicate. The Find Duplicates 2 column returns the term Table, which we’ll take care of later.

Executing this query in SQL returns results such as: Now if you drop the view from your data model and re-add it, EF will pick up the real primary key column that is labeled NID and your LINQ ...