Database Reference
In-Depth Information
the index properly, you should not get an error about duplicate entries. When
you're done, execute the
SELECT
statement to see all of the values of the table.
4. Using the
ALTER TABLE
statement, change the name of the index you created
for
birds_habitats
in the previous exercise (this was covered near the end
of this chapter). The index is now called
birds_habitats
. Rename it to
bird_habitat
.
5. Using the
ALTER TABLE
statement again, add three columns to the
humans
table in the
birdwatchers
database. Use a single
ALTER TABLE
statement
to add all three of these columns. Add one column named
country_id
to con-
tain two-character codes representing the country where each member is located.
Add another column named
membership_type
with enumerated values of
ba-
sic
and
premium
. Add a third column named
membership_expiration
with
a data type of
DATE
so that we can track when the membership of premium mem-
bers will expire. These members will have special privileges on the site and dis-
counts for items that we sell related tobird-watching.
