CREATE TABLE table_50520 ("Nominative" TEXT, "Ergative" TEXT, "Dative" TEXT, "Genitive" TEXT, "Instrumental" TEXT, "Adverbial" TEXT)

With chem-s as the dative, what is the ergative?
SELECT "Ergative" FROM table_50520 WHERE "Dative" = 'chem-s'
SELECT "Ergative" FROM "table_50520" WHERE "Dative" = 'chem-s'