The Artima Developer Community
Articles | News | Weblogs | Books | Forums
Artima Forums | Articles | Weblogs | Java Answers | News
Sponsored Link •

Java Buzz Forum
Correlated Subqueries are Evil and Slow. Or are They?

0 replies on 1 page.

Welcome Guest
  Sign In

Go back to the topic listing  Back to Topic List Click to reply to this topic  Reply to this Topic Click to search messages in this forum  Search Forum Click for a threaded view of the topic  Threaded View   
Previous Topic   Next Topic
Flat View: This topic has 0 replies on 1 page
justin cater

Posts: 19616
Nickname: justin78
Registered: Mar, 2011

Justin Cater is executive editor at Java Code Geeks
Correlated Subqueries are Evil and Slow. Or are They? Posted: May 30, 2016 12:44 PM
Reply to this message Reply

This post originated from an RSS feed registered with Java Buzz by justin cater.
Original Post: Correlated Subqueries are Evil and Slow. Or are They?
Feed Title: Java Code Geeks
Feed URL: http://feeds.feedburner.com/JavaCodeGeeks
Feed Description: Java 2 Java Developers Resource Center 		Latest Java Buzz Posts
Latest Java Buzz Posts by justin cater
Latest Posts From Java Code Geeks

Advertisement
A common myth in SQL is the idea that correlated subqueries are evil and slow. For example, this query here: SELECT first_name, last_name, (SELECT count(*) FROM film_actor fa WHERE fa.actor_id = a.actor_id) FROM actor a It “forces” the database engine to run a nested loop of the form (in pseudo code): for (Actor a : ...

Read: Correlated Subqueries are Evil and Slow. Or are They?

Topic: "Ruby isn’t the only gem" in Ben and Dion Previous Topic   Next Topic Topic: $BROWSER was a placeholder for a particular browser (eg UC, Safari).
Sponsored Links


Google
  Web Artima.com   

Copyright © 1996-2019 Artima, Inc. All Rights Reserved. - Privacy Policy - Terms of Use