Explain weak and strong entity setsweak and strong entity, Ask an Expert

Programming

Explain weak and strong entity sets?

Weak and Strong entity sets: A physically powerful entity set has a primary key. All tuples in the group are distinguishable through that key. A weak entity set has no primary key unless attributes of the tough entity set on which it depends are included. Tuples in a weak entity grouped are partition according to their relationship along with tuples within a strong entity set. Tuples inside each partition are discernible by a discriminator, that is a set of attributes. A strong entity set has a primary key. All tuples within the set are distinguishable through that key. A weak entity set has no primary key unless attributes of the strong entity set on that it depends are included. Tuples in a weak entity set are partitioned according to their relationship along with tuples in a strong entity set. Tuples within each partition are discernible through a discriminator that is a set of attributes.

View complete question

DBMS, Programming

Category:- DBMS
Reference No.:- M9544992

Have any Question?Write your Review or question?

Related Questions in DBMS

Sqlwrite a select statement that returns one column from

SQL Write a SELECT statement that returns one column from the Vendor table named Full Name. Create this column from the VendorContactFName and VendorContactLName columns. Format it as follows: last name, comma, first nam ...

Assignmenta restaurant is designing a database to keep

Assignment A restaurant is designing a database to keep track of customer services. A customer is defined as a customer ID, name, address and a telephone number. Customers are served by employees. Each employee is define ...

Question suppose we have two kinds of doctors hospital

Question : Suppose we have two kinds of doctors: hospital doctors and family physicians. In addition to the doctor's id number, name, specialty, and years of experience, we want to record the hospital name for the hospit ...

Assignment question - write and run sql statements to

Assignment Question - Write and run SQL statements to complete the following tasks Part A - DML 1. Locate the record in the vendor table that does not have a value for the attribute V_STATE 2. Find the customers whose ba ...

Relational database design a given the following business

Relational Database Design A) Given the following business rules, identify entity types, attributes (at least two attributes for each entity, including the primary key) and relationships, and then draw an Entity-Relation ...

Quesiton 1 what is data-manipulation language dml there are

Quesiton: 1. What is Data-Manipulation Language (DML)? There are four types of access in DML, explain each one. 2. Assume we have a Library Database consists of the following relations: author(author_id, first_name, last ...

The case study company received a detailed report from the

The case study company received a detailed report from the ECM consultant with a detailed list of data requirements, tools, and processes that are currently used to manage this data. The chief executive officer (CEO) and ...

Questionsuppose a prolog database exists that gives

Question: Suppose a Prolog database exists that gives information about states and capital cities. Some cities are big, others small. Some states are eastern, others are western. a. Write a query to find all the small ca ...

Suppose that you have designed a database for morgan

Suppose that you have designed a database for Morgan Importing that has the following tables: EMPLOYEE (EmployeeID, LastName, FirstName, Department, Phone, Fax, EmailAddress) STORE (StoreName, City, Country, Phone, Fax, ...

Sql query assignment -for this assignment you are to write

SQL Query Assignment - For this assignment you are to write your answers in a word document. This assignment is in three parts: Part A (reporting queries), Part B (query performance), Part C (query design). For this assi ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask DBMS Expert