SQL - Earlier posts in another blog

SQL Worksheet and key from earlier blog

http://12ecps.blogspot.com/2017/10/sqlworksheet-2017-18-88-1-observe.html

http://12ecps.blogspot.com/2017/10/sqlworksheet-2017-18-88-1-observe.html

SQL test

 http://12ecps.blogspot.com/2018/03/sql.html