CREATE TABLE "construction" (
  "1946_nos" text,
  "1947_nos" text,
  "date" real,
  "built_at" text,
  "lms_nos" text,
  "br_nos" text
);

Question: Which Built at has a Date of 1946, and a 1947 Nos of 3556/7?
SQL: SELECT "built_at" FROM "construction" WHERE "date"=1946 AND "1947_nos"='3556/7';

Question: Which Date has a 1946 Nos of 3156/7?
SQL: SELECT AVG("date") FROM "construction" WHERE "1946_nos"='3156/7';

Question: Which Date has a 1947 Nos of 3525-34?
SQL: SELECT COUNT("date") FROM "construction" WHERE "1947_nos"='3525-34';

Question: Which 1947 Nos has a BR Nos of 48730-9?
SQL: SELECT "1947_nos" FROM "construction" WHERE "br_nos"='48730-9';