CREATE TABLE table_204_481 (id NUMBER, "poll source" CLOB, "date ( s ) \ administered" CLOB, "sample\ size" NUMBER, "margin of\ error" CLOB, "andrew\ cuomo  ( d ) " CLOB, "rob\ astorino  ( r ) " CLOB, "other" CLOB, "undecided" CLOB)

what poll source had the largest sample size ?
SELECT "poll source" FROM table_204_481 ORDER BY "sample\nsize" DESC LIMIT 1
SELECT "poll source" FROM "table_204_481" ORDER BY "sample\nsize" DESC FETCH FIRST 1 ROWS ONLY