Question: What is average SiO 2, when Na 2 O is 7.53, and when Al 2 O 3 is less than 2.13?
SQL: SELECT AVG("SiO 2") FROM "2-15858905-1" WHERE "Na 2 O" = 7.53 AND "Al 2 O 3" < 2.13;

Question: 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?
SQL: SELECT MAX("K 2 O") FROM "2-15858905-1" WHERE "Na 2 O" > 1.87 AND "Fe 2 O 3" > 0.07 AND "Objects" = 'ritual disk' AND "Al 2 O 3" < 0.62;

Question: 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?
SQL: SELECT MAX("SiO 2") FROM "2-15858905-1" WHERE "K 2 O" > 0.16 AND "Fe 2 O 3" > 0.16 AND "Na 2 O" < 7.53;