Dynamic Pivoting In Redshift

Kevin Feasel

2017-11-08

Cloud

Maria Zakourdaev is not Redshift’s biggest fan:

Several days ago I have spent a few hours of my life figuring out how to do dynamic pivot in Amazon Redshift. To tell you the truth, I have expected much more from this DBMS SQL language.

Redshift is based on Postgre SQL 8.0.2 ( which was released in 2005 !!!! )

Anything you would want for this, not too difficult task,  does not exits.  No stored procedures. No JSON datatype. No variables outside of UDF, no queries inside UDFs. “UDF can be used to calculate values but cannot be used to call SQL functions”. Python UDFs also cannot query the data, only perform calculations.

Finally I have found one useful function LISTAGG that helped me to get distinct values of all pivoted columns.

Read on to see how Maria solved this problem.  And to tell the truth, I’m not Redshift’s biggest fan either.

Related Posts

Warning on Azure Consumption

Daniel Hutmacher doesn’t want you to have any Azure billing surprises: I wrote this quick-and-dirty script to let me know if I happen to forget to turn off a P15 instance, or if I configure a service with a super-expensive performance tier without realizing. Maxing out your free Azure credits may be depressing enough, but […]

Read More

DBAs in the Cloud

Brent Ozar argues that production DBAs will still be important even at cloud-only companies: One of my favorite recent examples was a company who came to me saying, “We’re spending about $2M per year in the cloud just on our databases alone. Can you help us reduce those costs?” Absolutely: with just a couple of […]

Read More

Categories

November 2017
MTWTFSS
« Oct Dec »
 12345
6789101112
13141516171819
20212223242526
27282930