- Create an address list for all employees, customer
contacts, and supplier contacts, sorted by name. For this exercise, use employee's last name
only.
- Change the previous query to use the employee's last name
and first name. (More
than one way to do this.)
- Change one of the previous queries to include an
additional column (call it Role) where each person is designated as Employee,
Customer, or Supplier.
SYNTAX
Without
duplication:
SELECT statement1
SELECT statement2
...
SELECT statement-last
ORDER BY column list
To include
all rows, regardless of duplication:
SELECT statement1
UNION ALL
...
SELECT statement-last
ORDER BY column list
Other set
operators (Oracle): INTERSECT and MINUS