[SQL] generate a number sequence without external functions

number_series.sql

with ones as (
  select base.n from (values (0), (1), (2), (3), (4), (5), (6), (7), (8), (9)) base(n)
), tens as (
  select 10 * ones.n as n from ones
), hundreds as (
  select 100 * ones.n as n from ones
--), thousands as (
--  select 1000 * ones.n as n from ones  
), num_series as (
  select
    ones.n + tens.n + hundreds.n /*+ thousands.n*/ as n
  from ones, tens, hundreds/*, thousands*/
  order by n asc
)

-- this will return a sequence of 0-999
select n from num_series;