Example in MySQL:
(myadmin@localhost) [jimk]> CREATE TABLE e (ecol ENUM('Bill', 'Sam', 'Jack'));
Query OK, 0 rows affected (0.10 sec)
(myadmin@localhost) [jimk]> INSERT INTO e VALUES('Bill');
Query OK, 1 row affected (0.00 sec)
(dbadmin@localhost) [jimk]> INSERT INTO e values ('Sue');
ERROR 1265 (01000): Data truncated for column 'ecol' at row 1
How do we do this in Vertica? With a Check Constraint!Example in Vertica:
dbadmin=> CREATE TABLE e (ecol VARCHAR(10) CONSTRAINT ecol_ck CHECK (ecol IN ('Bill', 'Sam', 'Jack')));
CREATE TABLE
dbadmin=> INSERT INTO e VALUES('Bill');
OUTPUT
--------
1
(1 row)
dbadmin=> INSERT INTO e VALUES ('Sue');
ERROR 7230: Check constraint 'public.e.ecol_ck' (e.ecol = ANY (ARRAY['Bill', 'Sam', 'Jack'])) violation: 'ecol=Sue'
Helpful link:
https://my.vertica.com/docs/9.1.x/HTML/index.htm#Authoring/AdministratorsGuide/Constraints/ConstraintTypes/CheckConstraints.htmHave fun!
About the Author
James Knicely
Vertica Field Chief Technologist
I've had the privilege of working with many database technologies in my career. But after being introduced to Vertica in May of 2011 as a client, I was hooked on the new technology after witnessing a query run in milliseconds that had previously ran for hours on the legacy database we had in place. It was then that I knew I wanted to eventually join the Vertica team, and 4 years later I did! I am currently a Vertica evangelist and am ready to help you get on board! Please feel free to reach out to me with any questions you have about Vertica and make sure to follow my Vertica Quick Tips!
