CREATE TABLE table_52909 ("Ship" CLOB, "Date Commissioned" FLOAT, "Gross Tonnage" FLOAT, "Propulsion" CLOB, "Material" CLOB)

Tell me the lowest date commissioned for iron rmsrhone and gross tonnage less than 2,738
SELECT MIN("Date Commissioned") FROM table_52909 WHERE "Material" = 'iron' AND "Ship" = 'rmsrhone' AND "Gross Tonnage" < '2,738'
SELECT MIN("Date Commissioned") FROM "table_52909" WHERE "Gross Tonnage" < '2,738' AND "Material" = 'iron' AND "Ship" = 'rmsrhone'