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ER Diagram Homework Help




Problems;1. (49 Points) Construct an E?R Diagram for the application described on the next page. Include;any additional assumptions you made about the application requirements. The assumptions;may not directly contradict anything given explicitly in the requirements. Hand?drawn diagrams;will not be accepted (even if they are scanned and stored digitally).;2. (11 Points) Reduce your E?R Diagram for Problem #1 to tables. Give a data dictionary;describing the contents of each table. The data dictionary should contain the list of attributes;for each table. For each attribute, the data dictionary should list the following;? Name of Attribute;? Data Type of Attribute (numeric, 2 character string, date/time, etc.);? Description of Attribute (What information does the attribute contain);? Integrity Constraints of Attribute (not null, unique, primary key, foreign key, must be;positive, data values it contains, etc.);Submission;Submit your assignment through Blackboard. If your assignment contains multiple files, zip;them into a single folder before submitting.;Notes;Points can be deducted from your assignment based on the quality of its presentation.;Handwritten assignments will not be accepted.;Application Description;A software development company wants to create a social network application where users can;post brief audio messages giving their thoughts.;? Each user of the application will have a password, a name (consisting of first name;and last name), an e?mail address, a registration date, years registered, and a;location (consisting of a city, state or province, and country). The e?mail address;uniquely identifies a user. The years registered should be computed from the;registration date.;? Each user may fall into one of three categories, normal, moderator, or guest. A user;may not fall into more than one of these categories at the same time. In addition to;the above user attributes, a normal user will have a membership handle. The;membership handle will be unique, but the user will still be identified by his or her email;address. A moderator will have a membership handle as well as a work;schedule.;? Users may follow other users. Each time one user follows another, one?s role is as;the follower, and the other?s role is as the thinker. A thinker may have many;followers, and a follower may follow many thinkers. For each follower/thinker;relationship, the system should store a Boolean value indicating whether or not the;thinker has blocked the follower.;? Normal users may post thoughts. A normal user may post many thoughts, but each;thought must belong to a single normal user. Each thought has an audio file name, a;number, a title, and a popularity score. In addition, a user may specify one or more;topics with each thought. A thought?s popularity score is computed based on the;average rating it receives from users (described below). Each thought can only be;identified by its number and the ID of the normal user that posted the thought.;? Users may rate other users? thoughts. A user may rate many thoughts, and each;thought may be rated by many users. Each time a user rates a thought, the system;should track the score given to it by the user. The score will have a range between 1;and 10. A user should not be allowed to rate the same thought twice.;? Moderators may censor thoughts if they determine them to be inappropriate. A;moderator can censor many thoughts, but each thought can be censored by only one;moderator. Each time a moderator censors a thought, the system should store the;date the thought was censored.;? In certain cases, thoughts may be given special awards. A thought may receive;several awards, and each award may be given to several thoughts. Each award has a;unique id number, a title, a description, and an amount. Awards are managed by;moderators. Each award must be managed by one moderator, and a moderator may;manage at most one award.


Paper#72949 | Written in 18-Jul-2015

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