Question: Which artist had a 4x Platinum?
SQL: SELECT "Artist" FROM "2-18382316-2" WHERE "Certification" = '4x Platinum';

Question: What was the highest peak position for the album One of the Boys?
SQL: SELECT MAX("Peak position") FROM "2-18382316-2" WHERE "Album" = 'One of the Boys';

Question: How many sales had a peak position of 1 and a certification of 6x platinum?
SQL: SELECT COUNT("Sales") FROM "2-18382316-2" WHERE "Peak position" = 1.0 AND "Certification" = '6x platinum';

Question: What album had a peak position of 6 and a certification of 3x Platinum?
SQL: SELECT "Album" FROM "2-18382316-2" WHERE "Certification" = '3x Platinum' AND "Peak position" = 6.0;

Question: How many sales had a peak position more than 2 and a Certification of 3x platinum?
SQL: SELECT COUNT("Sales") FROM "2-18382316-2" WHERE "Peak position" > 2.0 AND "Certification" = '3x platinum';