AVG
GROUP BY clause
Getting summarizing values
Aggregate function to aggregate function
Getting summarizing values
Exercise #11 (tips and solutions)
Tips and solutions
Getting summarizing values
SELECT statement
Exercise #54
Database «Ships»
Exercise #13
Computer Firm Database
Exercise #26 (tips and solutions)
Tips and solutions
Exercise #32
Database «Ships»
Exercise #26
Computer Firm Database
Exercise #27
Computer Firm Database
Exercise #53 (tips and solutions)
Tips and solutions