Question

Consider the following table :

id  |  Name  | City
1   |  Roger | Atlanta
2   |  Roger | Atlanta
3   |  Roger | Miami
4   |  Roger | Miami

Now what I want is if I enter as an input the id 1, the output should be id 2 (the other one that is in the same City). I’ve tried making a self join on the ‘City’ column, but it’s not working.

Answer 1

Would this work correctly?

SELECT t2.id FROM MyTable t1
JOIN MyTable t2 ON (t1.City = t2.City AND t1.id <> t2.id)
WHERE t1.id = @input