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 ...

table2 AS b ON a.Id = b.Id GROUP BY b.Id, a.OtherId HAVING (COUNT(DISTINCT a.UserId) > 1) Executing this query in SQL returns results such as: In LINQ, I make a simple call to the same view: ...