Question: What was the average year that xuxa 3 earned the certification 2x platinum, and that the sales were higher than 750000?
SQL: SELECT AVG("Year") FROM "2-12937449-3" WHERE "Certification" = '2x platinum' AND "Álbum" = 'xuxa 3' AND "Sales" > 750000.0;

Question: What were the number of sales before 1991?
SQL: SELECT "Sales" FROM "2-12937449-3" WHERE "Year" < 1991.0;

Question: What álbum was in the year 1996?
SQL: SELECT "Álbum" FROM "2-12937449-3" WHERE "Year" = 1996.0;