You are creating a database for storing information for a Netflix like service. The database stores movies with id, title, filename and TV shows with id, title. TV Shows have episodes. Each episode has a corresponding TV show, a season id, an episode id, title, filename. Some episodes have a next episode (i.e. the episode that will automatically start showing once the user finishes watching the current episode!). The database also stores users, each user has an id, username, password. Users may watch zero or more movies, zero or more TV show episodes. For each movie or episode, the database stores a watch time value for each user, indicating how many minutes the user watched that movie or show. Finally, the database stores which movie appears similar to which other movie for a given user (to be able to make recommendations). Construct an E-R diagram (based on a Chen's model) to represent the above requirements. Make sure you include all appropriate entities, relationships, attributes, and cardinalities.

You are creating a database for storing information for a Netflix like service. The database stores movies with id, title, filename and TV shows with id, title. TV Shows have episodes. Each episode has a corresponding TV show, a season id, an episode id, title, filename. Some episodes have a next episode (i.e. the episode that will automatically start showing once the user finishes watching the current episode!). The database also stores users, each user has an id, username, password. Users may watch zero or more movies, zero or more TV show episodes. For each movie or episode, the database stores a watch time value for each user, indicating how many minutes the user watched that movie or show. Finally, the database stores which movie appears similar to which other movie for a given user (to be able to make recommendations). Construct an E-R diagram (based on a Chen's model) to represent the above requirements. Make sure you include all appropriate entities, relationships, attributes, and cardinalities.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Write a script that adds an index to the MyGuitarShop database for the zip code field in the Addresses table. Write a script that implements the following design in a database named MyWebDB: In the Downloads table, the UserID and ProductID columns are the foreign keys. In the Users table, the EmailAddress and LastName columns are required, but the FirstName column is not. Include a statement to drop the database if it already exists. Include statements to create and select the database. Include any indexes that you think are necessary. 3. Write a script that adds rows to the database that you created in exercise 2. Add two rows to the Users and Products tables. Add three rows to the Downloads table: one row for user 1 and product 1; one for user 2 and product 1; and one for user 2 and product 2. Use the GETDATE function to insert the current date and time into the DownloadDate column. Write a SELECT statement that joins the three tables and retrieves the data from these tables like…
mysql> DESC bookauthor; mysql> DESC author; mysql> DESC book; | Field | Туре | Field | Туре | Field Тур | int(11 | varchai author_order | int(11 royaltyshare | decima: author_id isbn | author_id | int(1: | ssn lastname | firstname | varch: | phone | address | city | state | zip | varch: | varch: isbn var I name | type pub_id I price | advance I ytd_sales I pubdate var var | varch: | varch: | varch: | varch: | varch: | int dec | dec int mysql> DESC bookeditor; | dat | Field | Туре mysql> DESC editor; mysql> DESC publisher; editor_id | int(11) | varchar(1 | Field isbn | Field | Туре editor_id ssn pub_id | int(11) | varchar(40) varchar(40) varchar(20) varchar(2) lastname name firstname address | phone editor_position salary | city state
If you were given the task of defining a Java class MetaDisplay with a method static void print Table(String r), you would create code that accepts the name of a relation as its argument, runs the query "select * from r," and outputs the results as a table with the attribute names in the header. Use the JDBC API function print Table(String r).
Create a Java application for Checkers called CheckersStockTakingApp. The application should consist of a client side, a server side and a database.4.1 Create a database called checkersproducts using MySQL or any relational database management software you are comfortable with. The database should have a table called products that consists of the following columns and properties:prodID AUTO NUMBER (primary)prodName VARCHAR (30)prodType VARCHAR (30)prodPrice DECIMAL (6,2)4.2 Create a server class that will do the following:• Run on port 8000 and listen to a client• Initially output a “server is starting” message to the screen• Make a connection to the database• Receive product details from the client• Add product details to products table• Send a message back to client to inform whether or not the product was added• Handle any exceptions• Close the server when the user types "stop" on the client side and output a message"Server stopping...." 4.3 Create a client class that will do the…
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I need help debugging this. // Cooper College maintains a master file of students and credits // earned. Each semester the master is updated with a transaction // file that contains credits earned during the semester. // Each file is sorted in Student ID number order. start Declarations num masterID string masterName num masterCredits num transID num transCredits string bothDone = "N" num HIGH_VALUE = 999999 InputFile master InputFile trans OutputFile newMaster getReady() while bothDone = "N" detailLoop() endwhile allDone() stop getReady() open master "studentFile.dat" open trans "semesterCredits.dat" open newMaster "updatedStudentFile.dat" readMaster() readTrans() checkBoth() return readMaster() input masterID, masterName, masterCredits from master if eof then masterID = HIGH_VALUE endif return readTrans() input transID, transCredits from trans if eof then…
Example: Suppose a school wants to store the data of teachers and the subjects they teach. They create a table that looks like this: Since a teacher can teach more than one subjects, the table can have multiple rows for a same teacher. What is normalization? teacher_id subject teacher_age 111 Maths 38 111 Physics 38 222 Biology 38 333 Physics 40 333 Chemistry 40
// Import necessary modules and setup the Express appconst express = require('express');const fs = require('fs');const app = express();const wordsDataPath = './words-app/data/words.json';const collectionsDataPath = './words-app/data/collections.json';const PORT = process.env.PORT || 3000; // Endpoint to search for a certain number of words using a query textapp.get('/api/words/:query', (req, res) => { let query = req.params.query; let count = req.query.count || 10; count = count > 100 ? 100 : count; // Limit to 100 words per request let words = fs.readFileSync(wordsDataPath); words = JSON.parse(words); let matchingWords = words.filter(word => word.includes(query)); let selectedWords = []; for (let i = 0; i < count && matchingWords.length > 0; i++) { let index = Math.floor(Math.random() * matchingWords.length); selectedWords.push(matchingWords[index]); matchingWords.splice(index, 1); } res.send(selectedWords);}); // Endpoint to read all…
Question 9 A use case description is generic with few details. For this reason it does not contain numbered steps and alternatives to those steps. That is the kind of information contained in a user story. True False Question 10 Which git command would you use to update a remote repository with the current changes made in a local repository? pull clone commit add None of the above Question 11 The UML symbol to show composition/aggregation is a diamond. The diamond should be attached to the containing class contained class fat headed arrow center of a dashed line
/* Created with SQL Script Builder v.1.5 */ /* Type of SQL : SQL Server */ CREATE TABLE EMPLOYEE ( EMP_CODE int, EMP_TITLE varchar(4), EMP_LNAME varchar(15), EMP_FNAME varchar(15), EMP_INITIAL varchar(1), EMP_DOB datetime, JOB_CODE varchar(5), STORE_CODE int ); INSERT INTO EMPLOYEE VALUES('1','Mr.','Williamson','John','W','5/21/1964','SEC','3'); INSERT INTO EMPLOYEE VALUES('2','Ms.','Ratula','Nancy','','2/9/1969','MGR','2'); INSERT INTO EMPLOYEE VALUES('3','Ms.','Greenboro','Lottie','R','10/2/1961','GEN','4'); INSERT INTO EMPLOYEE VALUES('4','Mrs.','Rumpersfro','Jennie','S','6/1/1971','GEN','5'); INSERT INTO EMPLOYEE VALUES('5','Mr.','Smith','Robert','L','11/23/1959','GEN','3'); INSERT INTO EMPLOYEE VALUES('6','Mr.','Renselaer','Cary','A','12/25/1965','GEN','1'); INSERT INTO EMPLOYEE VALUES('7','Mr.','Ogallo','Roberto','S','7/31/1962','MGR','3'); INSERT INTO EMPLOYEE VALUES('8','Ms.','Johnsson','Elizabeth','I','9/10/1968','SEC','1'); INSERT INTO EMPLOYEE…
use c++ language You run an e-comměrce website and want to record the last N order ids in a log. Implement a data structure to accomplish this, with the following API: record(order_id): adds the order_id to the log get_last(i): gets the ith last element from the log. i is guaranteed to be smaller than or equal to N. You should be as efficient with time and space as possible.