CREATE TABLE table_204_125 (id DECIMAL, "state" TEXT, "type" TEXT, "name" TEXT, "title" TEXT, "royal house" TEXT, "from" TEXT, "to" TEXT)

who ruled longer , zhao or zhaoxiang ?
SELECT "name" FROM table_204_125 WHERE "name" IN ('zhao', 'zhaoxiang') ORDER BY "from" - "to" DESC LIMIT 1
SELECT "name" FROM "table_204_125" WHERE "name" IN ('zhao', 'zhaoxiang') ORDER BY "from" - "to" DESC NULLS LAST LIMIT 1