CREATE TABLE "fleet" (
  "diagram_s" text,
  "quantity" real,
  "numbers" text,
  "completed" real,
  "length" text
);

Question: What are the numbers for the item completed earlier than 1904?
SQL: SELECT "numbers" FROM "fleet" WHERE "completed"<1904;

Question: For the item with more than 10, and numbers of 53-58, 61-72, what is the lowest completed?
SQL: SELECT MIN("completed") FROM "fleet" WHERE "quantity">10 AND "numbers"='53-58, 61-72';

Question: What is the quantity of the item with the numbers of 29-36?
SQL: SELECT AVG("quantity") FROM "fleet" WHERE "numbers"='29-36';