CREATE TABLE table_204_778 (id NUMBER, "code" NUMBER, "county" CLOB, "former province" CLOB, "area  ( km2 ) " NUMBER, "population\ census 2009" NUMBER, "capital" CLOB)

did mombasa or tana river have a larger population in 2009 ?
SELECT "county" FROM table_204_778 WHERE "county" IN ('mombasa', 'tana river') ORDER BY "population\ncensus 2009" DESC LIMIT 1
SELECT "county" FROM "table_204_778" WHERE "county" IN ('mombasa', 'tana river') ORDER BY "population\ncensus 2009" DESC FETCH FIRST 1 ROWS ONLY