PostgreSQL Alter Table: Alter a table to add a new column
2. Write a SQL statement to add a column region_id to the table locations.
Here is the structure of the table locations.
postgres=# \d locations Column | Type | Modifiers ----------------+-----------------------+----------- location_id | numeric(4,0) | street_address | character varying(40) | postal_code | character varying(12) | city | character varying(30) | state_province | character varying(25) | country_id | character varying(2) |
Now execute the following statement.
Sample Solution:
Code:
ALTER TABLE locations
ADD region_id INT;
Output:
See the structure of the table after alteration.
postgres=# \d locations
Column | Type | M
----------------+-----------------------+--
location_id | numeric(4,0) |
street_address | character varying(40) |
postal_code | character varying(12) |
city | character varying(30) |
state_province | character varying(25) |
country_id | character varying(2) |
region_id | integer |
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Previous: Write a SQL statement to rename the table countries to country_new.
Next: Write a SQL statement to change the data type of the column region_id to text in the table locations.
What is the difficulty level of this exercise?
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