Question

I need to select the rows that do not have the first column matching. For example, from the data below;

Person            | Room
---------------------------------------
ben               | 1
jake              | 3
jake              | 1
steven            | 2
james             | 1
james             | 2
james             | 3

The query would only return these rows:

Person            | Room
---------------------------------------
ben               | 1
jake              | 3
steven            | 2
james             | 1

It doesn’t matter what value the room column returns.
And it needs to be able to work with increasing room numbers and different names.

I’ve had no look searching for a answer and can’t figure out how to do it, however it might be my current mindset and it might be really easy to do.

Answer 1

SELECT Person, MIN(Room) AS Room
FROM YourTable
GROUP BY Person

And if you can guarantee that the ONLY_FULL_GROUP_BY setting will always be turned off, the following is also possible in MySql:

SELECT Person, Room
FROM YourTable
GROUP BY Person

But I’d use the MIN() function just to be safe…