MySQL insert into Statement Exercises: Insert records into the table countries in which the country_id column will be unique and auto incremented and the country_name will be filled up by 'N/A' if no value assigned
MySQL insert into Statement: Exercise-11 with Solution
11. Write a SQL statement to insert records into the table countries to ensure that the country_id column will not contain any duplicate data and this will be automatically incremented and the column country_name will be filled up by 'N/A' if no value assigned for that column.
Create the table countries. CREATE TABLE IF NOT EXISTS countries ( COUNTRY_ID integer NOT NULL AUTO_INCREMENT PRIMARY KEY, COUNTRY_NAME varchar(40) NOT NULL DEFAULT 'N/A', REGION_ID integer NOT NULL );
Sample Solution:
INSERT INTO countries VALUES(501,'India',102);
Let execute the above code in MySQL 5.6 command prompt.
Here is the structure of the table:
mysql> SELECT * FROM countries; +------------+--------------+-----------+ | COUNTRY_ID | COUNTRY_NAME | REGION_ID | +------------+--------------+-----------+ | 501 | India | 102 | +------------+--------------+-----------+ 1 row in set (0.00 sec)
INSERT INTO countries(region_id) VALUES(109);
Let execute the above code in MySQL 5.6 command prompt.
Here is the structure of the table:
mysql> SELECT * FROM countries; +------------+--------------+-----------+ | COUNTRY_ID | COUNTRY_NAME | REGION_ID | +------------+--------------+-----------+ | 501 | India | 102 | | 502 | N/A | 109 | +------------+--------------+-----------+ 2 rows in set (0.00 sec)
INSERT INTO countries(country_name,region_id) VALUES('Australia',121);
Let execute the above code in MySQL 5.6 command prompt.
Here is the structure of the table:
mysql> SELECT * FROM countries; +------------+--------------+-----------+ | COUNTRY_ID | COUNTRY_NAME | REGION_ID | +------------+--------------+-----------+ | 501 | India | 102 | | 502 | N/A | 109 | | 503 | Australia | 121 | +------------+--------------+-----------+ 3 rows in set (0.00 sec)
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