Consider the following ER diagram for a social network application. Write the SQL-DDL statements, to create tables for the following ER diagram and capture as many of the constraints as possible. Specify your decisions with the foreign key constraints.

Q: Create an SQL database of the above ER-diagram using “create table” statements. The type of…

A: ER DIAGRAM: Please run each query one by one

Q: What does the phrase "disjointness constraint" mean?

A: Start: One relationship's super type might be another's subtype. Super type/subtype hierarchies are…

Q: Write a SQL trigger to carry out the following action: If an account is deleted, then write a…

A: create trigger [trigger_name] [before | after]  {insert | update | delete}  on [table_name]  [for…

Q: Using Employees and Departments tables: a. Write a query that will display the First_Name and…

A: Creating table "Employees" and "Departments": CREATE TABLE Employees (id int(11) NOT NULL…

Q: What constraint is imposed on am attribute that is declared as Primary Key? What bemefit does that…

A: The solution to the given problem is below.

Q: The Car Maintenance team also wants to store the actual maintenance operations in the database. The…

A: DELETE CASCADE: - When we constitute a foreign key using this option, it deletes the referencing…

Q: 6. Create a view Course_Grades showing GPA of all the students in a class with Class_Code: 11794.…

A: 6. CREATE VIEW Course_Grades AS  SELECT S.Stu_Num…

Q: Based on the information below, what would be the attributes for the  bridge tables? I know the…

A: Attributes: The attributes are defined as the qualities of t particular class  For example, if Book…

Q: What's the difference between overlapped and separate constraints?

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Q: class type | country bb Germany numGuns | bore | displacement Bismarck 8 15 42000 Iowa bb USA 16…

A: Hey there, I am writing the required solution based on the above given question. Please do find the…

Q: Explain the concept of join dependencies and how they relate to Fifth Normal Form (5NF).

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Q: What features do normalization procedures that use functional dependencies have?

A: Functional reliance: Between two characteristics—primary key attributes and non-key attributes…

Q: Implement a new independent entity phone in the Sakila database. Attributes and relationships are…

A: There is only one error in the above code and that is the ALTER TABLE command on the address table.…

Q: How does a "self-referencing table" work, and in what scenarios is it commonly used?

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Q: Task 4: As a part of marketing strategy, the Marketing team continuously conducting an advertising…

A: Actually, database is a used to stores the data.

Q: How do primary key, candidate key, and superkey differ?

A: In the context of relational databases, a primary key, candidate key, and superkey are all used to…

Q: Write an SQL statement to list ItemNumber and ItemDescription for all items that cost more that $100…

A: Below is the query:

SQL Query

Structured Query Language is the full form of SQL. It is one of the standard languages to deal with the relational database. It is used to insert, update, delete, and search the records stored in a RDBMS. The relational databases are created and managed by using SQL.