CREATE TABLE table_name_77 (became_duchess VARCHAR2, name VARCHAR2)

When did eleonor magdalene of the palatinate-neuburg become duchess?
SELECT became_duchess FROM table_name_77 WHERE name = "eleonor magdalene of the palatinate-neuburg"
SELECT "became_duchess" FROM "table_name_77" WHERE "eleonor magdalene of the palatinate-neuburg" = "name"