Example:
dbadmin=> SELECT sqrt(9);
sqrt
------
3
(1 row)
dbadmin=> SELECT cbrt(27);
cbrt
------
3
(1 row)
But what if I need a function to calculate the arithmetic nth root of a number? No problem. I can create my own!
dbadmin=> CREATE OR REPLACE FUNCTION nrt (x FLOAT, y FLOAT) RETURN FLOAT
dbadmin-> AS
dbadmin-> BEGIN
dbadmin-> RETURN POWER(x,(1/y));
dbadmin->
dbadmin-> END;
CREATE FUNCTION
dbadmin=> SELECT nrt(390625, 4);
nrt
-----
25
(1 row)
dbadmin=> SELECT nrt(256, 4);
nrt
-----
4
(1 row)
dbadmin=> SELECT nrt(27, 3);
nrt
-----
3
(1 row)
dbadmin=> SELECT nrt(9, 2);
nrt
-----
3
(1 row)
Helpful Links:
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!
