create sql cheat sheet examples for each reserved keyword and each operation

create new or modify existing from web
instruct how to install free DB on windows to try your queries
postgres
create simple educations DB with 3 tables
each table takes one page to print
doc file
sections one
2 pages per key word
one page query examples from easy to complicated
second page answers for each example

section 2
by analogy with section one
but for operations for example
groupby
inner join
outer join