Create a duplicate copy of the MySQL table named countries with both structure and data, naming it dup_countries

MySQL Create Tables: Exercise-4 with Solution

4. Write a MySQL query to create a duplicate copy of countries table including structure and data by name dup_countries.

Sample Solution:

-- Creating a new table named 'dup_countries' if it doesn't already exist
CREATE TABLE IF NOT EXISTS dup_countries
-- Populating the new table by selecting all columns and rows from the existing 'countries' table
AS SELECT * FROM countries;

Let execute the above code in MySQL command prompt

Here is the structure of the table:

mysql> DESC dup_countries;
+--------------+---------------+------+-----+---------+-------+
| Field        | Type          | Null | Key | Default | Extra |
+--------------+---------------+------+-----+---------+-------+
| COUNTRY_ID   | varchar(2)    | YES  |     | NULL    |       |
| COUNTRY_NAME | varchar(40)   | YES  |     | NULL    |       |
| REGION_ID    | decimal(10,0) | YES  |     | NULL    |       |
+--------------+---------------+------+-----+---------+-------+
3 rows in set (0.11 sec)

Explanation:

The above MySQL code creates a new table named "dup_countries" if it doesn't already exist. It populates the new table by selecting all columns and rows from the existing "countries" table using the "AS SELECT * FROM countries" statement. In essence, it duplicates the structure and data of the "countries" table into the new table "dup_countries".

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a SQL statement to create the structure of a table dup_countries similar to countries.
Next: Write a SQL statement to create a table countries set a constraint NULL.