CREATE TABLE table_204_84 (id DECIMAL, "no" DECIMAL, "peak" TEXT, "location" TEXT, "elevation  ( m ) " DECIMAL, "prominence  ( m ) " DECIMAL, "col height  ( m ) " DECIMAL, "col location" TEXT, "parent" TEXT)

what is the tallest peak in the alps ?
SELECT "peak" FROM table_204_84 ORDER BY "elevation (m)" DESC LIMIT 1
SELECT "peak" FROM "table_204_84" ORDER BY "elevation (m)" DESC NULLS LAST LIMIT 1