Don't prompt articles, books, interactive websites to fill out queries. Have not programmed, only recently made up after a long break. Team, the normalization remember, you only need a couple of days to work out while on sql-ex.ru
job 40 went back on codewars
think have interesting jobs, though in sql there is still nothing came through.
Interested in the format of the finished database and tasks in the sample or on the approach, which provides a TK and you should form a table.