Select player that does not have a specific score set

I want to select all players that do not have a specific scoreboard objective value set. I have tried doing testfor @a[score_hasJoined=] and testfor @a[score_hasJoined_min=], but it still won't work. The hasJoined objective is a dummy objective, and therefore users do not start with 0 when they join.

I want to set all players' score without the score to 0. I have thought that there maybe is an objective that automatically starts at 0 but I couldn't find one.

Solution 1:

The problem is that you can't target someone without a score using a score selector. So the solution, not surprisingly, is to give everyone a score. You don't have to change anyone's score value either; instead, just "increment" everyone's score by 0, in your case, with the following command:

/scoreboard players add @a hasJoined 0

Better yet, throw that command in a command block that is triggered off a 20Hz clock, and you're guaranteed that everyone always has a score.

The way this works is that everyone that already has a score in the hasJoined objective won't have their score changed, but everyone else will have their hasJoined score set to 0.