CREATE TABLE table_201_25 (id NUMBER, "party" CLOB, "leader" CLOB, "from" CLOB, "to" CLOB)

which leader served more years , william leslie , or joyce shannon ?
SELECT "leader" FROM table_201_25 WHERE "leader" IN ('william leslie', 'joyce shannon') ORDER BY "to" - "from" DESC LIMIT 1
SELECT "leader" FROM "table_201_25" WHERE "leader" IN ('william leslie', 'joyce shannon') ORDER BY "to" - "from" DESC FETCH FIRST 1 ROWS ONLY