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1. Top results related to what are the different types of coordinate systems in computer graphics

   • What are the different types of keys in RDBMS?

     Top Answer

     Answered Nov 10, 2009 · 21 votes

     From here and here: (after i googled your title)

     • Alternate key - An alternate key is any candidate key which is not selected to be the primary key
     • Candidate key - A candidate key is a field or combination of fields that can act as a primary key field for that table to uniquely identify each record in that table.
     • Compound key - compound key (also called a composite key or concatenated key) is a key that consists of 2 or more attributes.
     • Primary key - a primary key is a value that can be used to identify a unique row in a table. Attributes are associated with it. Examples of primary keys are Social Security numbers (associated to a specific person) or ISBNs (associated to a specific book). In the relational model of data, a primary key is a candidate key chosen as the main method of uniquely identifying a tuple in a relation.
     • Superkey - A superkey is defined in the relational model as a set of attributes of a relation variable (relvar) for which it holds that in all relations assigned to that variable there are no two distinct tuples (rows) that have the same values for the attributes in this set. Equivalently a superkey can also be defined as a set of attributes of a relvar upon which all attributes of the relvar are functionally dependent.
     • Foreign key - a foreign key (FK) is a field or group of fields in a database record that points to a key field or group of fields forming a key of another database record in some (usually different) table. Usually a foreign key in one table refers to the primary key (PK) of another table. This way references can be made to link information together and it is an essential part of database normalization

     Other Answers

     Answered Sep 21, 2014 · 89 votes

     (I) Super Key – An attribute or a combination of attribute that is used to identify the records uniquely is known as Super Key. A table can have many Super Keys.

     E.g. of Super Key

     • ID
     • ID, Name
     • ID, Address
     • ID, Department_ID
     • ID, Salary
     • Name, Address
     • Name, Address, Department_ID

     So on as any combination which can identify the records uniquely will be a Super Key.

     (II) Candidate Key – It can be defined as minimal Super Key or irreducible Super Key. In other words an attribute or a combination of attribute that identifies the record uniquely but none of its proper subsets can identify the records uniquely.

     E.g. of Candidate Key

     • ID
     • Name, Address

     For above table we have only two Candidate Keys (i.e. Irreducible Super Key) used to identify the records from the table uniquely. ID Key can identify the record uniquely and similarly combination of Name and Address can identify the record uniquely, but neither Name nor Address can be used to identify the records uniquely as it might be possible that we have two employees with similar name or two employees from the same house.

     (III) Primary Key – A Candidate Key that is used by the database designer for unique identification of each row in a table is known as Primary Key. A Primary Key can consist of one or more attributes of a table.

     E.g. of Primary Key - Database designer can use one of the Candidate Key as a Primary Key. In this case we have “ID” and “Name, Address” as Candidate Key, we will consider “ID” Key as a Primary Key as the other key is the combination of more than one attribute.

     (IV) Foreign Key – A foreign key is an attribute or combination of attribute in one base table that points to the candidate key (generally it is the primary key) of another table. The purpose of the foreign key is to ensure referential integrity of the data i.e. only values that are supposed to appear in the database are permitted.

     E.g. of Foreign Key – Let consider we have another table i.e. Department Table with Attributes “Department_ID”, “Department_Name”, “Manager_ID”, ”Location_ID” with Department_ID as an Primary Key. Now the Department_ID attribute of Employee Table (dependent or child table) can be defined as the Foreign Key as it can reference to the Department_ID attribute of the Departments table (the referenced or parent table), a Foreign Key value must match an existing value in the parent table or be NULL.

     (V) Composite Key – If we use multiple attributes to create a Primary Key then that Primary Key is called Composite Key (also called a Compound Key or Concatenated Key).

     E.g. of Composite Key, if we have used “Name, Address” as a Primary Key then it will be our Composite Key.

     (VI) Alternate Key – Alternate Key can be any of the Candidate Keys except for the Primary Key.

     E.g. of Alternate Key is “Name, Address” as it is the only other Candidate Key which is not a Primary Key.

     (VII) Secondary Key – The attributes that are not even the Super Key but can be still used for identification of records (not unique) are known as Secondary Key.

     E.g. of Secondary Key can be Name, Address, Salary, Department_ID etc. as they can identify the records but they might not be unique.

     Other Answers

     Answered Nov 10, 2009 · 9 votes

     Ólafur forgot the surrogate key:

     A surrogate key in a database is a unique identifier for either an entity in the modeled world or an object in the database. The surrogate key is not derived from application data.

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     1/5

   • What are the different types of errors in python?

     Top Answer

     Answered Feb 09, 2015 · 3 votes

     These errors can, and should, be defined by modules and projects as they are developed - so, there is no limited and "closed" set of errors like you are asking for.

     Python introspection capabilities allow one to see, through the interactive console, which errors are defined as derived directly from "Exception" - but there could be more:

     >>> [err.__name__ for err in Exception.__subclasses__()]['TypeError', 'StopIteration', 'ImportError', 'OSError', 'EOFError', 'RuntimeError', 'NameError', 'AttributeError', 'SyntaxError', 'LookupError', 'ValueError', 'AssertionError', 'ArithmeticError', 'SystemError', 'ReferenceError', 'BufferError', 'MemoryError', 'Warning', 'error', 'Error']

     Note that exception itself is derived from BaseException, which subclasses are not limited to "error" exceptions, but to Exceptions used in flow control as well:

     >>> [err.__name__ for err in BaseException.__subclasses__()]['Exception', 'GeneratorExit', 'SystemExit', 'KeyboardInterrupt']

     Bottom line: knowing the total number of errors is impossible and irrelevant for learning the language. Each function/library you are dealing with can define new ones, and you should check the documentation to know which exceptions they can throw.

     (On a side note, the __sublass__ method I used above does return a list of the classes that are direct descendants of that class. I them pick the __name__ attribute of each class to display)

     The document posted by @GP89 in the comments will also show the errors which are not direct descendants of exception: https://docs.python.org/2/library/exceptions.html#exception-hierarchy

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     2/5

   • What are the different types of storage in HTML5 ?

     In this article, you will get to know about different types of Web storage in HTML5. The web storage is more secure and large amounts of data can be stored locally on the client-side web browser. All the data is stored in key-value pairs. 

     In HTML5 there are two types of web storage API.

     • localStorage
     • SessionStorage

     localStorage: It is used to store data on the client side. It has no expiration time, so the data in the LocalStorage exists always till the user manually deletes it.

     Syntax:

     • For storing data in web storage: The key and value both should be string or number;

     LocalStorage.setItem("key", "value");

     • For getting data from web storage: We will pass the key and it will return value.

     LocalStorage.getItem("key");

     Example: In this example, we will use local storage.

     HTML

     <!DOCTYPE html><html><head>    <style>        body {            color: green;            text-align: center;font size...

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     3/5

   • What are the different types of props can be send from one component to the other using properties in React?

     Top Answer

     Answered Sep 21, 2018 · 1 votes

     I'm not sure if you've just structured this question in a way that makes it a little difficult to understand but with React, you can send any complex object via the props.

     Prop types are simply there as a way to strongly type what you expect to be passed down.

     Check out the docs to see all the accepted prop types for React:

     https://reactjs.org/docs/typechecking-with-proptypes.html

     Taking specific note of the fact you can both create your own custom validator, or even set it to "any" which means it doesn't care what the type is as long as it's there:

     // A value of any data type requiredAny: PropTypes.any.isRequired, // You can also specify a custom validator. It should return an Error // object if the validation fails. Don't `console.warn` or throw, as this // won't work inside `oneOfType`. customProp: function(props, propName, componentName) { if (!/matchme/.test(props[propName])) { return new Error( 'Invalid prop `' + propName + '` supplied to' + ' `' + componentName + '`. Validation failed.' ); } },

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     4/5

   • What are the different types of dependencies in Node.js ?

     NPM (Node Package Manager) is a package manager for the Node JavaScript platform. It consists of an npm registry that enables Open-Source developers to publish and share their code. You might need to install a few packages to streamline your project. Packages contain code written by other developers. Our root project has a package.json file that keeps track of all the packages we’ve installed. This file contains information about the project and defines the attributes that npm uses for installing dependencies, running scripts, and identifying the entry point for the package.

     • Production Dependencies
     • Development Dependencies
     • Peer Dependencies
     • Optional Dependencies
     • Bundled Dependencies

     Create Package json file: Run the following command from the root directory of the project to create the package.json file.

     npm init

     Note: Npm init prompts you for information about your project such as package name, version, test command, git repository, keywords, author and license.

     Check the images on geeksforgeeks

     Creating a package.json file 

     Adding Package: Following is the syntax to install the package:

     npm install <package_name>

     Example: Run the following command to install express package:

     npm install express

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     Installing Express...

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2. People also ask

   How are homogeneous coordinate systems used in computer graphics?

   • Homogeneous coordinate systems are used in two ways in computer graphics. One of them is by taking an extra value (for example taking the third element in two dimensions and the fourth element in three dimensions) extra element can be any value that will be the divisor of other components which is used occasionally.

   Computer Graphics Homogeneous Coordinates - GeeksforGeeks

   www.geeksforgeeks.org/computer-graphics-homogeneous-coordinates/

   See all results for this question

   Do computers use a coordinate system?

   • Computers also use a coordinate system when displaying graphics. This system shares many things in common with the cartesian system but is different in certain, very important ways. To begin, it is hopefully easy to imagine that the computer screen can be divided into a number of smaller squares like a piece of graph paper.

   Introduction to Computer Science | 2018 | Coordinate Systems - GitHu…

   fcs-cs.github.io/cs1-2018/modules/01-introduction/computer-coordinates/

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   What is a world coordinate system?

   • World Coordinate System - Also known as the "universe" or sometimes "model" coordinate system. This is the base reference system for the overall model, ( generally in 3D ), to which all other model coordinates relate.

   Intro to Computer Graphics: Coordinate Systems - University of Illinois

   www.cs.uic.edu/~jbell/CourseNotes/ComputerGraphics/Coordinates.html

   See all results for this question

   What is a Cartesian coordinate system?

   • In this unit we will look at different coordinate systems and explain their similarities and differences. Hopefully you are familiar with the standard cartesian coordinate system from geometry class. Two major axes cross at right angles. Each axis is essentially a number line going from -∞ to ∞ and crossing at their respective zeros.

   Introduction to Computer Science | 2018 | Coordinate Systems - GitHu…

   fcs-cs.github.io/cs1-2018/modules/01-introduction/computer-coordinates/

   See all results for this question

3. www.cs.uic.edu › ComputerGraphics › CoordinatesIntro to Computer Graphics: Coordinate Systems

   www.cs.uic.edu › ComputerGraphics › Coordinates

   • Cached

   We'll learn about the conversion process a little later, but in the meantime, here is a list of some of the coordinate systems you may encounter: World Coordinate System - Also known as the "universe" or sometimes "model" coordinate system. This is the base reference system for the overall model, ( generally in 3D ), to which all other model ...

4. www.geeksforgeeks.org › computer-graphicsComputer Graphics Homogeneous Coordinates - GeeksforGeeks

   www.geeksforgeeks.org › computer-graphics

   • Cached

   Jan 25, 2023 · Homogeneous coordinate systems are used in two ways in computer graphics. One of them is by taking an extra value (for example taking the third element in two dimensions and the fourth element in three dimensions) extra element can be any value that will be the divisor of other components which is used occasionally.

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6. fcs-cs.github.io › computer-coordinatesIntroduction to Computer Science | 2018 | Coordinate Systems

   fcs-cs.github.io › computer-coordinates

   • Cached

   • The Cartesian Coordinate System
   • Computer Graphics Coordinate System
   • Assignment

   Hopefully you are familiar with the standard cartesian coordinate system from geometry class. Two major axes cross at right angles. Each axis is essentially a number line going from -∞ to ∞ and crossing at their respective zeros. In this way we can define any point on this infinite plane as the combination of two values, one in the x direction (hor...

   See full list on fcs-cs.github.io

   Computers also use a coordinate system when displaying graphics. This system shares many things in common with the cartesian system but is different in certain, very important ways.

   See full list on fcs-cs.github.io

   Read through these two tutorials on creating elliptical perspective on Bill Martin’s Guide to Drawing 1. elliptical perspective 2. Major and Minor Axes http://guidetodrawing.com/site/assets/files/1027/gtd-190.jpg 1. To start, using ellipses and lines, try to recreate the image from Bill’s tutorial on elliptical perspective 2. Now can you change the...

   See full list on fcs-cs.github.io

7. www.youtube.com › watchCoordinate systems in Computer Graphics - YouTube

   www.youtube.com › watch

   • Cached

   This lecture covers 5 types of coordinate systems (Model, World, Camera,Perspective, Screen) used in Computer Graphics and their utility and properties.

   • Video Duration: 32 min
   • Views: 7.2K

   • Author: Computer Science by SJ

8. ocw.mit.edu › courses › 6-837-computer-graphics-fallCoordinates and Transformations - MIT OpenCourseWare

   ocw.mit.edu › courses › 6-837-computer-graphics-fall

   Matrices have two purposes. (At least for geometry) Transform things. e.g. rotate the car from facing North to facing East. Express coordinate system changes. e.g. given the driver's location in the coordinate system of the car, express it in the coordinate system of the world.

9. Videos

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     3:40

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     Introduction to Coordinate System - Introduction Computer Graphics and Output Primitives

     Apr 2, 2021

     9.4K Views

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     15:59

     byjus.com

     Types of Coordinate Systems - Cartesian & Polar Coordinate Systems

     Mar 23, 2021

     8.5K Views

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     10:25

     youtube.com

     Lecture -- Coordinate Systems

     Jan 1, 2021

     13.4K Views

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10. www3.cs.stonybrook.edu › ~qin › coursesCSE528 Computer Graphics: Theory, Algorithms, and Applications

    www3.cs.stonybrook.edu › ~qin › courses

    Coordinate Systems • You might be familiar with different types of coordinate systems: –Cartesian –Polar –Spherical –Cylindrical • Computer graphics and visualization applications use several distinct coordinate systems: model, world, view and display • Usually they use Cartesian coordinates

11. eng.libretexts.org › Bookshelves › Computer_Science2.1: Pixels, Coordinates, and Colors - Engineering LibreTexts

    eng.libretexts.org › Bookshelves › Computer_Science

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    Pixel Coordinates. A digital image is made up of rows and columns of pixels. A pixel in such an image can be specified by saying which column and which row contains it. In terms of coordinates, a pixel can be identified by a pair of integers giving the column number and the row number.