Question
Perform the following using SQL:
Create tables with appropriate primary and foreign keys
Insert sample data (minimum 5 researchers, 6 publications)
List publications by a given researcher
Find researchers who have not authored any publication
Find the publication with the highest number of authors
List venues that have more than two publication
Answer :
Word Count : 693
In a research publication database, the main entities can be represented using three tables: `Researcher`, `Publication`, and `Authorship`. The `Researcher` table stores details of researchers, the `Publication` table stores information about publications and their venues, and the `Authorship` table establishes the many-to-many relationship between researchers and publications. A researcher can author many publications, and a publication can have many researchers. Therefore, the `Authorship` table uses a composite primary key and foreign keys to maintain referential integrity. ```sql CREATE TABLE Researcher ( researcher_id INT PRIMARY KEY, researcher_name VARCHAR(100) NOT NULL, department VARCHAR(100), email VARCHAR(100) UNIQUE ); CREATE TABLE Publication ( publication_id INT PRIMARY KEY, title VARCHAR(200) NOT NULL, venue VARCHAR(150) NOT NULL, publication_year INT ); CREATE TABLE Authorship ( researcher_id INT, publication_id INT, author_order INT, PRIMARY KEY (researcher_id, publication_id), FOREIGN KEY (researcher_id) REFERENCES Researcher(researcher_id), FOREIGN KEY (publication_id) REFERENCES Publication(publication_id) ________ ___ ________ _________ _____.
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In a research publication database, the main entities can be represented using three tables: `Researcher`, `Publication`, and `Authorship`. The `Researcher` table stores details of researchers, the `Publication` table stores information about publications and their venues, and the `Authorship` table establishes the many-to-many relationship between researchers and publications. A researcher can author many publications, and a publication can have many researchers. Therefore, the `Authorship` table uses a composite primary key and foreign keys to maintain referential integrity. ```sql CREATE TABLE Researcher ( researcher_id INT PRIMARY KEY, researcher_name VARCHAR(100) NOT NULL, department VARCHAR(100), email VARCHAR(100) UNIQUE ); CREATE TABLE Publication ( publication_id INT PRIMARY KEY, title VARCHAR(200) NOT NULL, venue VARCHAR(150) NOT NULL, publication_year INT ); CREATE TABLE Authorship ( researcher_id INT, publication_id INT, author_order INT, PRIMARY KEY (researcher_id, publication_id), FOREIGN KEY (researcher_id) REFERENCES Researcher(researcher_id), FOREIGN KEY (publication_id) REFERENCES Publication(publication_id) ________ ___ ________ _________ _____.
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