CREATE TABLE table_78164 ("Position" FLOAT, "Song Title" TEXT, "Artist" TEXT, "Sales" FLOAT, "Highest Position" FLOAT)

What were the sales for Dj Casper when he was in a position lower than 13?
SELECT "Sales" FROM table_78164 WHERE "Position" < '13' AND "Artist" = 'dj casper'
SELECT "Sales" FROM "table_78164" WHERE "Artist" = 'dj casper' AND "Position" < '13'