CREATE TABLE table_204_476 (id NUMBER, "name" CLOB, "date built" NUMBER, "builder" CLOB, "works no." NUMBER, "wheels" CLOB, "cylinders" CLOB, "notes" CLOB, "withdrawn" NUMBER)

how long after fairfield was no. 1 built ?
SELECT (SELECT "date built" FROM table_204_476 WHERE "name" = 'no.1') - (SELECT "date built" FROM table_204_476 WHERE "name" = 'fairfield')
SELECT (SELECT "date built" FROM "table_204_476" WHERE "name" = 'no.1') - (SELECT "date built" FROM "table_204_476" WHERE "name" = 'fairfield')