CREATE TABLE table_37211 ("Name" CLOB, "Birth" CLOB, "Marriage" CLOB, "Became Duchess" CLOB, "Ceased to be Duchess" CLOB, "Death" CLOB, "Spouse" CLOB)

When did eleonor magdalene of the palatinate-neuburg become duchess?
SELECT "Became Duchess" FROM table_37211 WHERE "Name" = 'eleonor magdalene of the palatinate-neuburg'
SELECT "Became Duchess" FROM "table_37211" WHERE "Name" = 'eleonor magdalene of the palatinate-neuburg'