如何获得表的每个值？

Question

所以我试图检查哪个玩家拥有所有图标，因为查询变成了3个图标：

SELECT PlayerID from OwnedIcon GROUP BY PlayerID HAVING COUNT(IconID)=3;

但是，如果我不想在数字中使用它，那么如果我想稍后添加图标，那么查询将不会发生变化？我试过这个，但似乎错了：

SELECT PlayerID from OwnedIcon GROUP BY PlayerID HAVING COUNT(IconID)= SELECT COUNT (*) FROM Icon;

有没有办法改变它，还是我必须坚持使用数字？

Answer 1

SELECT PlayerID 
from OwnedIcon 
GROUP BY PlayerID 
HAVING COUNT(distinct IconID) = (SELECT COUNT(*) FROM Icon)