What is the highest SiO 2, when K 2 O is greater than 0.16, when Fe 2 O 3 is greater than 0.16, and when Na 2 O is less than 7.53?
SELECT MAX SiO 2 FROM table WHERE K 2 O > 0.16 AND Fe 2 O 3 > 0.16 AND Na 2 O < 7.53