A database about magazine subscribers typically contains a list of subscribers to each magazine but does not contain a list of those who do not subscribe. How then does such a database determine that a person does not subscribe to a particular magazine?
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- Access path A database table is composed of records and fields hold data. Data is stored in records. A field is a part of a record and contains a single piece of data for the subject of the record. The access path for finding the list of books is AUTHOR: AuthorID, Lname BOOKAUTHOR: AuthorID, ISBN BOOKS: Pubdate, ISBNSQL A database used in an order-entry system is to contain information about customers, items, and orders. The following information is to be included. – For each customer: Customer number (unique) Valid “ship to” addresses (several per customer) Balance Credit limit Discount – For each order: Heading information: customer number, “ship-to” address, date of order. Detail lines (several per order), each giving item number, quantity ordered – For each item: Item number (unique) Warehouses Quantity on hand at each warehouse Item description For internal processing reasons, a “quantity outstanding” value is associated with each detail line of each order. [This value is initially set equal to the quantity of the item ordered and is progressively reduced to zero as partial shipments are made.] Design a database for this data.In a relational database, the number of columns in a table that are able to satisfy the constraints that have been defined may be decreased by the use of an operation called select. Which is it: the right answer or the erroneous answer?
- In a relational database, the number of columns in a table that are able to satisfy the constraints that have been defined may be decreased by the use of an operation called select.Which is it: the right answer or the erroneous answer?Chevening Scholarship Database's stores data about each application received by the Chevening Foundation. As a database designer, you're assigned to design the new database system according to the following requirements: Each applicant can submit one or more applications (one application per year). Each application form is submitted by only one applicant. Each application has a unique application ID number, application date, class level, GPA, GPA scale, academic honours, extracurricular activities, community activities, other scholarship awarded and financial need. The applicant's record contains student ID, student's last name, first name, date of birth, address, city, state, zip code, phone number and email address. Each school can be associated with one or more applications. Each application is associated with only one school. Each school has a unique school ID, school name, type, address, city, zip code and phone number. Each application must include two or more recommendations.…When working with a relational database, a select operation may be used to reduce the amount of space used by a table by removing columns that meet certain requirements.Is this the right answer or the wrong answer?
- ormulate the following queries in Structured Query Language SQL The following tables form part of a database held in an RDBMS: Employee (empNo, fName, lName, address, DOB, sex, position, salary, deptNo) Department (deptNo, deptName, mgrEmpNo) Project (projNo, projName, deptNo) WorksOn (empNo, projNo, dateWorked, hoursWorked) where Employee contains employee details and empNo is the key. Department contains department details and deptNo is the key. mgrEmpNo identifies the employee who is the manager of the department. There is only one manager foreach department. Project contains details of the projects in each department and the key is projNo (notwo departments can run the same project). WorksOn contains details of the hours worked by employees on each project, and empNo/ projNo/dateWorked form the key. Formulate the following queries in Structured Query Language SQL List all the details of employees who are female and born after 1990. List employee numbers and names of all…In database testing, what do we need to check normally?Explain the concept of indexing in a relational database and its impact on query performance.
- A well constructed relational database table has four properties.Database Foundations: Design a database to produce the following reports. Do not use any surrogate keys in your design. For each guide, list the guide number, guide last name, guide first name, address, city, state, postal code, telephone number, and date hired. For each trip, list the trip ID number, the trip name, the location from which the trip starts, the state in which the trip originates, the trip distance, the maximum group size, the type of trip (hiking, biking, or paddling), the season in which the trip occurs, and the guide number, first name, and last name of each guide. A guide may lead many trips and a trip may be led by many different guides. For each client, list the client number, client last name, client first name, address, city, state, postal code, and telephone numberA single value in a database record is called a(n) table schema field records O key
