A block-nested loop (BNL) is an algorithm used to join two relations in a relational database. This algorithm is a variation of the simple nested loop join and joins two relations and (the "outer" and "inner" join operands, respectively). Suppose . In a traditional nested loop join, will be scanned once for every tuple of . If there are many qualifying tuples, and particularly if there is no applicable index for the join key on , this operation will be very expensive. The block nested loop join algorithm improves on the simple nested loop join by only scanning once for every group of tuples. Here groups are disjoint sets of tuples in and the union of all groups has the same tuples as . For example, one variant of the block nested loop join reads an entire page of tuples into memory and loads them into a hash table. It then scans , and probes the hash table to find tuples that match any of the tuples in the current page of . This reduces the number of scans of that are necessary. A more aggressive variant of this algorithm loads as many pages of as can be fit in the available memory, loading all such tuples into a hash table, and then repeatedly scans . This further reduces the number of scans of that are necessary. In fact, this algorithm is essentially a special-case of the classic hash join algorithm. The block nested loop runs in I/Os where is the number of available pages of internal memory and and is size of and respectively in pages. Notethat block nested loop runs in I/Os if fits in the available internal memory. (Wikipedia).
C Programming Tutorial - 39: Nested Loops
In this tutorial we'll learn to use nested loops. Nested loops are loops within loops. We'll learn to use to loops to print the following pattern-: * ** *** **** ***** Thanks for watching!
From playlist The Bad Tutorials: C Programming
More videos like this online at http://www.theurbanpenguin.com We take a moment to look at for loops within Python using Python 3 installed on an openSUSE Linux desktop. First we iterate through modules installed on the system using sys.modules; then we move into reading files line by line
From playlist Python
4.2: Nested Loops - p5.js Tutorial
This video looks at loops nested in loops. What does it mean to have a for loop in the draw() loop? How do you draw a grid of shapes with two loops? Code: https://thecodingtrain.com/tracks/code-programming-with-p5-js/code/4-loops/2-nested 🕹️ p5.js Web Editor Sketch: https://editor.p5js.
From playlist Start learning here!
Python Programming 7. Nested If Statements
This is the seventh in a course of computer science video lessons introducing programming with Python. It covers the If statement in more detail, in particular, how to nest If blocks inside each other. Particular care needs to be taken with the indentation of your code if you are going t
From playlist GCSE Computer Science
6.6: Nested Loops - Processing Tutorial
This video looks at nested loops, i.e. a loop inside a loop. Support this channel on Patreon: https://patreon.com/codingtrain Contact: https://twitter.com/shiffman Send me your questions and coding challenges!: https://github.com/CodingTrain/Rainbow-Topics Link to code on Github: https
From playlist 6: Loops - Processing Tutorial
Basic intro to answer the question, "What's a Loop?" If there's a set of data, (we'll use an array for this example, but it doesn't have to be,) and you want to perform the same manipulation to every piece in that set of data, you can use something called a loop. Loops have some complex
From playlist Computer Science and Software Engineering Theory with Briana
How to Make a For Loop in Python
This video explains the basics of for loops in Python including looping over lists, numerical ranges, the continue keyword and the break keyword.
From playlist Python Basics
In this video, you’ll learn about block vs inline elements. They help to control how HTML elements stack. We hope you enjoy! To learn more, check out our Basic HTML tutorial here: https://edu.gcfglobal.org/en/basic-html/ #html #blockelements #inlineelements
From playlist HTML
Python Loops Tutorial | Python For Loop | While Loop In Python | Python Training | Simplilearn
This video on Python Loops Tutorial covers Python for loop and while loop. You will learn to write nested loops in Python and get an idea about using break and continue statements in Python. You will also use if else conditions in for loops and while loops. 🔥Free Python Course with comple
Python 3 Programming Course 10: Iteration and 'for' Loops
This video teaches you how to loop over lists and other collections in Python. You'll learn how a Python loop works, how iteration works, how to use the Python range() function, and more. By the end of this video you'll have some practice with iterating over list items using Loops (the mos
From playlist Python 3
Where HTML beats C? - Computerphile
The ultimate example of trouble from digital promiscuity. HTML is more tolerant than C because it has to be. Professor Brailsford explains. Deep Learning: https://www.youtube.com/watch?v=l42lr8AlrHk Secure Web Browsing: https://www.youtube.com/watch?v=E_wX40fQwEA AI Game Playing Challen
From playlist Subtitled Films
Control Statements In C Explained | Types Of Control Statements In C | C Programming | Simplilearn
This video by simplilearn will explain you about Control Statements In C programming. This Control Statements In C Explained tutorial will help you learn types of control statements in c, what are control statements in c, c programming control statements, decision-making control statements
From playlist C++ Tutorial Videos
While Loop In Python | Python While Loop Explained | Python Tutorial For Beginners | Edureka
** Python Certification Training: https://www.edureka.co/data-science-python-certification-course ** This Edureka video on 'While Loop In Python' will help you understand how you can use a while loop in python with concepts like nested while loop, infinite while loop, etc. Following are th
From playlist Python Programming Tutorials | Edureka
Advanced Eventmachine by Jonathan Weiss
We use EventMachine heavily in production. It is handling uploads to S3, managing thousands of messages a second or distributing agent workload. This taught us a load about EventMachine and some weired corner-cases. I want to about such advanced EventMachine topics and shared some use-case
From playlist Ruby Conference 2011
Loops in Java | Conditional Statements in Java | Java Tutorial For Beginners | Simplilearn|
🔥Post Graduate Program In Full Stack Web Development: https://www.simplilearn.com/pgp-full-stack-web-development-certification-training-course?utm_campaign=JavaLoopsTutorial-hs45eeZ326U&utm_medium=DescriptionFirstFold&utm_source=youtube 🔥Caltech Coding Bootcamp (US Only): https://www.simpl
🔥Post Graduate Program In Full Stack Web Development: https://www.simplilearn.com/pgp-full-stack-web-development-certification-training-course?utm_campaign=JavaLive09Feb2022&utm_medium=DescriptionFirstFold&utm_source=youtube 🔥Caltech Coding Bootcamp(US Only): https://www.simplilearn.com/c
From playlist Simplilearn Live
Java Developer Course 2022 | Java Developer Tutorial For Beginners | Java Full Course | Simplilearn
🔥Post Graduate Program In Full Stack Web Development: https://www.simplilearn.com/pgp-full-stack-web-development-certification-training-course?utm_campaign=JavaDeveloperFullCourse25Mar22&utm_medium=DescriptionFirstFold&utm_source=youtube 🔥Caltech Coding Bootcamp (US Only): https://www.si
From playlist Simplilearn Live
For Loop In Python | Python For Loop Tutorial | Python Tutorial | Python Programming | Simplilearn
This Python tutorial will help you understand what is for loop and how to use for loop in Python. In programming, statements are executed sequentially. The first statement in a code is executed first, followed by the second one, and so on. There may be a situation when you need to execute
🔥Post Graduate Program In Full Stack Web Development: https://www.simplilearn.com/pgp-full-stack-web-development-certification-training-course?utm_campaign=JavaLive09Feb2022&utm_medium=DescriptionFirstFold&utm_source=youtube 🔥Caltech Coding Bootcamp(US Only): https://www.simplilearn.com/co
From playlist Simplilearn Live