source code
['--"\n-- about NULL values and foreign keys\n-- ...
[
'
--"\n-- about NULL values and foreign keys\n--
...
['''--" -- about NULL values and foreign keys -- ================================== -- -- we never use NULL values because they have a special behaviour with respect -- to comparisons (they are not even equal to themselves) -- ...
'''
--"
-- about NULL values and foreign keys
-- ==================================
--
-- we never use NULL values because they have a special behaviour with
respect
-- to comparisons (they are not even equal to themselves)