PostgreSQL Insert Record: Insert NULL values into a column of a table

4. Write a SQL statement to insert NULL values into region_id column for a row of countries table.

Sample Solution:

Code:

-- This SQL statement inserts a new row into the 'countries' table with specified values, including a NULL value.

INSERT INTO countries (country_id, country_name, region_id) VALUES('C3','UK',NULL);

Explanation:

• The INSERT INTO statement is used to add new rows into a table.
• countries is the name of the table where the new row will be inserted.
• (country_id, country_name, region_id) specifies the columns into which the values will be inserted.
• VALUES('C3','UK',NULL) provides the values to be inserted into the specified columns. In this case, 'C3' is inserted into the 'country_id' column, 'UK' is inserted into the 'country_name' column, and NULL is inserted into the 'region_id' column. This demonstrates inserting a NULL value explicitly into a column.

Here is the command to see the list of inserting rows :

postgres=# SELECT * FROM countries;
 country_id | country_name | region_id
------------+--------------+-----------
 C1         | India        |      1002
 C2         | USA          |
 C3         | UK           |
(3 rows)

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