added sql file for exercise 1
created and added two tables to ex2.sql
added ex3.sql and corresponding ex3.db
added ex4.sql
added ex5.sql
added ex6.sql, commented out notes in ex2.sql
added-updated ex8.sql, added ex9.sql
created code.sql and mydata.db
added ex10.sql
added ex11.sql
updated code.sql with alter table data, created ex12.sql
corrected syntax errors in code.sql
updated code.sql to try to output correct info from database