CREATE TABLE table_203_2 (id DECIMAL, "name" TEXT, "mineral" TEXT, "opened" TEXT, "closed" TEXT, "years connected" TEXT, "notes" TEXT)

which quarry was the last to open ?
SELECT "name" FROM table_203_2 ORDER BY "opened" DESC LIMIT 1
SELECT "name" FROM "table_203_2" ORDER BY "opened" DESC NULLS LAST LIMIT 1