CREATE TABLE table_21458142_1 (sales_breakdown VARCHAR, publisher VARCHAR, title VARCHAR)

What's the sales breakdown for Nintendo's Mario Kart DS?
SELECT sales_breakdown FROM table_21458142_1 WHERE publisher = "Nintendo" AND title = "Mario Kart DS"
SELECT "sales_breakdown" FROM "table_21458142_1" WHERE "Mario Kart DS" = "title" AND "Nintendo" = "publisher"