What is the highest K 2 O, when Na 2 O is greater than 1.87, when Fe 2 O 3 is greater than 0.07, when Objects is Ritual Disk, and when Al 2 O 3 is less than 0.62?
SELECT MAX K 2 O FROM table WHERE Na 2 O > 1.87 AND Fe 2 O 3 > 0.07 AND Objects = ritual disk AND Al 2 O 3 < 0.62