CREATE TABLE table_203_586 (id NUMBER, "#" NUMBER, "nation" CLOB, "qualification tournament" CLOB, "place in qt" NUMBER, "sailor" CLOB)

which nation came in last in the 2007 worlds qualification tournament ?
SELECT "nation" FROM table_203_586 WHERE "qualification tournament" = '2007 worlds' ORDER BY "place in qt" DESC LIMIT 1
SELECT "nation" FROM "table_203_586" WHERE "qualification tournament" = '2007 worlds' ORDER BY "place in qt" DESC FETCH FIRST 1 ROWS ONLY