PostgreSQL Insert Record: Create a duplicate of one table
3. Write a SQL statement to create duplicates of countries table named country_new with all structure and data.
Here in the following is the structure of the table countries.
Column | Type | Modifiers --------------+-----------------------+----------- country_id | character varying(2) | country_name | character varying(40) | region_id | numeric(10,0) |
Sample Solution:
Code:
CREATE TABLE country_new
AS SELECT * FROM countries;
Here is the command to see the structure and list of the inserting rows :
postgres=# \d country_new; Column | Type | Modifiers --------------+-----------------------+----------- country_id | character varying(2) | country_name | character varying(40) | region_id | numeric(10,0) | postgres=# SELECT * FROM country_new; country_id | country_name | region_id ------------+--------------+----------- C1 | India | 1002 C2 | USA | (2 rows)
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Previous: Write a SQL statement to insert one row into the table countries against the column country_id and country_name.
Next: Write a SQL statement to insert NULL values into region_id column for a row of countries table.
What is the difficulty level of this exercise?
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