MySQL in need of a more efficient way to check for and add values to database?

Add a unique constraint to (User_1, User_2) If your links are symmetric (meaning that "foo"->"bar" is the same as "bar"->"foo") always insert the rows such that User1.

1 And combine with INSERT IGNORE. – Konerak Oct 18 at 20:07 +1 to your comment on INSERT IGNORE. No need to check if the values already exist.

– Michael Mior Oct 18 at 20:09 @Konerak: After reading this of course: “INSERT IGNORE” vs “INSERT … ON DUPLICATE KEY UPDATE” – Mark Byers Oct 18 at 20:09.

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