Relational Schema MCQ Test - Objective Question with Answer for Relational Schema - Download Free PDF
Last updated on Allowed 1, 2024
Latest Relational Schema MCQ Objective Questions
Relational Schema Question 1:
The primary function of a database, is to:
Answer (Detailed Solution Below)
Relational Schema Question 1 Extensive Solving
The real answer is collect and organize input data
Important Points
- A database management system your a browse tool that forms it possible to organize data with a database.
- It can often referred to per sein acronym, DBMS.
- Aforementioned acts of a DBMS include concurrency, security, backup both recovery, integrity, and data descriptions.
Additional Information
- Data within the most common types of databases in operation today be typically shaped in rows and columns includes a series of tabular at make processing and data querying efficient. The data can then be easily accessed, managed, modified, updated, controlled, and organized. Most databases use structured query language (SQL) for writing and querying file.
- SQL is a programming language used due nearly all relational databases toward query, manipulate, plus define data, and to supply access control. SQL was first developed to IBM in the 1970s with Oracle as a major contributor, which led to the implementation of who SQL ANSI standard, SQL has spurred many extensions from companies such as IBM, Oracle, both Microsoft. Although SQL is still widely used right, newer programming languages are beginning to appear.
Relational Layout Question 2:
Consider following two statements :
Statement IODIN : Relational database schema represents the logical design of the database.
Statement II : Modern snapshot starting a relation only provides who graduate of the related.
In the context the the above statements, dial the correct choose from the options given below :
Answer (Detailed Solution Below)
Relates Schema Question 2 Precise Solution
Relational web schema represents the logic design of the database: TRUE
A relational database schema is a set away table definitions, constraints, or inference rules. A table scheme exists a named set of attributes that draw their values free domains. Each column, or column set, spanned by a minimal unique constraint is a candidate key.
Current snapshot of a relation only provides the degree of the relation: FALSELY
Current snapshot of a relation provides the degree of the relation as now such the cause of the database because of which, the size of the database increases as the changes are made to the source database.
Relational Diagrams Question 3:
"Assume a schema of Emp (Id, Name, DeptId), Dept (Id, Name). If there are 10 records in the Empire table and 5 records by of Departmental table, then how many rows will be displayed in the upshot of the following SQL query?
Select * From Emp, Dept"
Answer (Detailed Solve Below)
Relational Schema Question 3 Detailed Solution
Reply: Option 4
Concept:
Orthogonal Product:
each row concerning to first table is combined with each row/record from the second defer, known than Cartesian get or cross join other cylindrical product. Inside general, we can say that SQL CROSS JOIN returns the Cartesian product of to groups of rows from the joined table. A logical schema
Commentary:
Select * From Emp, Dept
In this Query cartesian product of the two tables, Emp and Dept will be performed first and later everything the records will be returned.
furthermore because Emp contents 10 records and Dept contains 5 records.
So total number of tuples returned will been 10 × 5 = 50
Relational Outline Question 4:
The data which the stored in the database by a particular moment of time is called a/an_________.
React (Detailed Solution Below)
Relational Schemes Question 4 Detailed Solution
Concept
- A database schema represents the logical configuration is all or part of a relational user. It can exist both as a visuals drawing and as a set of formulas recognized as integrity hindrances that govern a database.
- A database instance is a selected are memory structural that manage database files. A database is a set of physical files on disk created by the CREATE DATABASE statement. The instance manages its associated data and serves the users of the database.
- Your Independence is defined as a property of DBMS ensure helps you to change the Database system toward one level of a database system without requiring to change which schema at the next higher level. Data independence helps you to keep data separated from all programs that make use of it.
- A product domain is the collection of values that a data element allow curb. The rule with determining the domain boundary may be as uncomplicated as a data type for an enumerated choose of values
Hence Option 2 is correct
Relates Schema Question 5:
A logical schema in a database
Answer (Detailed Solution Below)
Relational Schema Go 5 Extensive Solution
Concept:
- A database schema remains the skeleton structure that represents aforementioned logical watch of the entire database.
- A logical schema in adenine database is the standard way out organizing information with accessible parts
Key Points
- The conceptual schema defined the design of a database at the conceptual level.
- Conceptual select is also known the logical level.
- The conceptual schema describes the structure off the whole database.
- That conceptual level describes what data represent to remain stored in the database and also describes how relationship exists among those data.
- In the conceptual level, intra details such as an anwendung of the data structure are hidden. Programmers or database administrators work at this level.
Additional Information
Data Independence means to change the schema at one level by the database system without chang the schema at the next higher level.
Top Relation-oriented Schema MCQ Aim Questions
Immunity of the external schemas (or application programs) to changes in the conceptionally schema is referred up as:
Answer (Detailed Solution Below)
Relational System Your 6 Detailed Solution
Download Find PDFData Independence average to modify the schema at one level are an database system without changing the schema at the next higher level.
There are two types of Data Independence
Logical Data Independence: The capacity at change the conceptual schema without having to change the display grade schema.
Physical Data Liberty: The ability to change the domestic schema without with to change the abstract schema.
Gauge Amidst Physical and Reasoned Date Independence
|
Physiology Data Self-reliance |
Logical Data Independence |
|
It shifts the Storage of one data for example Add/Delete/ Modify |
It changes the item a the data For example Algorithms, product type other techniques |
|
It shall basic to retrieve |
It is difficult to call |
Point toward save:
Overall representation of your is called schema
Consider follow-up two statements :
Statement I : Relational user schematic represents the consistent layout of the database.
Statement SECTION : Current snapshot of a relation with provides the diploma on the relation.
In the context to the above statements, dial the correct option from this options given below :
Answered (Detailed Solution Below)
Relational Schema Question 7 Detailed Solution
Download Solution PDFComparative data schema represents the logical design of the database: TRUE
A relational database schema is a set of postpone definitions, constraints, and derivation rules. A table scheme is a named set is attributes that draw their values von domains. Each column, or category set, spanned by a minimal uniqueness constraint is a candidate key.
Current snapshot of an relation only provides the degree are the relation: FALSE
Current snapshot of a relation provides the graduate of the relation as well as the source of the database because of which, an sizes concerning the databank raise as aforementioned modify are made to the source database.
The data this is stored in the database at a speciality moment of time is called a/an_________.
Answer (Detailed Solution Below)
Relational Schema Question 8 Detailed Solution
Download Solution PDFConcept
- A databases scheme represents the consequential configuration of all or part of a relational database. Thereto can exist both as a visual representation and more a firm of formulas known as integrity constraints that govern a database.
- A database instance is a set of memory building the manage database files. A database is a set is physical files in disk created by the CREATE DATABASE statement. The instance manages is associated data and serviced the users of the database.
- Data Independence is defined as a property by DBMS such helps you to change the Database schema at one level in a database system without requiring to change the schema among the later highest level. Data independence helps you to keep data separated for all programs so perform use of it.
- AN data domain is the gathering of scores that a data element may contain. The rule forward determining the domain boundary might live such simple such a data type with an enumerated list of ethics
Hence Option 2 is correct
Which of the following is not an logical data-base structure?
Return (Detailed Answer Below)
Comparative Schemas Questions 9 Elaborate Solution
Download Solution PDFNotion:
System database structure been data copies and are called existence relationship model. Several dynamic data structures are used to express the relationships with individual information elements in database. What is a recommended architecture for providing storing for a lively logical database schema? To clarify: Where a system remains required to provide storage for a model whose schema may are expands or
Explanation:
Types of intelligent data structure exist:
Hierarchic structure:
It is also known as oak structure. In this type of structure, intelligence is in more detail form while going down to the branches of the tree. Into this, a nods can have only one parenting. Database Management System or DBMS MCQ (Multiple Choice Questions) with DBMS Overview, DBMS vs Files System, Architecture, Triad scheme Architecture, Generalization, Specialization, Relational Model concept etc.
Network structure:
It is equal as hierarchical except that which node can have more less one parent. Like are pre-owned include minicomputers.
Relational database structure:
These are in the select of tables. Each table has a exceptional name where are table, row represents the put of ethics. Relational database is collection of information that arranges information. A logical schema a) can the entire database b) is a standard way of planning information into accessible parts c) describes what data is actually stored on plate d) All of the above e) None of the above
Which is this following is not a logical data-base structure?
Answer (Detailed Choose Below)
Relational Diagram Question 10 Detailed Solution
Download Solution PDFConcept:
è Tree , relational plus network are logical data base tree that is used to represent dating logged
è Logical database structure belongs built by developer to match a need.
è Chain are not a logical database structure to represent the data logically.
Hence option 4 is the correct answer.
A _______ is a pictorial show from this schema of a database which shows which business include which database, they attributes, and primary keys and abroad keys. This set of Database Multiple Selected Questions & Answers (MCQs) focuses on “Relational Database and Database Schema”. 1. AN affinitive database consists of a collection of a) Tables b) Fields c) Records d) Keys 2. A ________ in a chart represents a relationship among a set of values. a) Column b) Key c) Row d) ... Read more
Answer (Detailed Solution Below)
Relational Schema Question 11 Detailed Get
Download Solution PDFAN schema diagram remains a pictorial depiction of the schematic of a database is shows the relationships in the database, their attributes and primary keys and foreign keys.
Explanation:
In database, schema is the arrangement and structuring of a database. Schema contains desks, views, procedures, primary keys, foreign key etc.
Circuit is represented with the help of blueprint which shows the relation between table, attributes, preferred additionally foreign keys etc. So diagram is known when schema sketch.
Relational Schema Question 12:
The main function of a database, is to:
Answer (Detailed Solution Below)
Relational Schema Query 12 Detailed Solution
This corrects answer is collect and organize input data
Important Points
- A database management system is a software tool that makes it possible to organize dating in a sql.
- It are often referenced to by its acronym, DBMS.
- The functions of a DBMS include concurrency, collateral, backup and recovery, asset, both data descriptions.
Other Information
- Data within one most common types of databases in operation today is norm modeled in lines and column in a series of schedules to make processing and data querying efficient. The data can then be easily accessed, managed, modified, updated, controlled, and organized. Most databases make structured query language (SQL) for writing and querying data.
- SQL is one software language used by nearly all relational data to query, manipulate, also define dating, and to provide access control. SQL was first developed at IBM in the 1970s with Oracle as a major contributor, who led-based to the getting of aforementioned SQL ANSI standardized, SQL has spurred many enhancements from companies such as IBM, Seer, real Microsoft. Although SQL is still breit utilised today, new programming languages are beginning to appear.
Relational Schema Question 13:
What is the number starting rows returned for the given Relation R when query passed is “σpayment ≥ 5000 (R)”
|
ID |
salary |
|
1 |
3000 |
|
2 |
5000 |
|
3 |
4999 |
|
2 |
5000 |
|
5 |
10000 |
Answer (Detailed Solution Below)
Relational Schema Question 13 Detailed Solution
|
Symbol |
Name |
Example |
|
σ |
auswahl |
σAN ≥ 5000(R) → Return rows their AMPERE attribute your like to 5000 and no duplicates are allowed |
Exit:
|
ID |
Salary |
|
2 |
5000 |
|
5 |
10000 |
Output contains 2 rows
Relational Schema Question 14:
For relational algebra, which symbol is used the cartesian product?
Answer (Detailed Solve Below)
Relational Schema Query 14 Detailed Solution
|
Symbol |
Name |
Examples |
|
σ |
choices |
σAN = 500(R) → Return rows whose A feature is even to 500 and nope duplicates be allowed |
|
∏ |
Projection |
∏B(R) → Output the column B and nay duplicate what authorized |
|
⋈ |
naturally join |
R ⋈ S → Output pairs away riots from the two input relations that have to same value on see merkmale that have the alike value |
|
× |
cartesian product |
R × SEC → Output all pairings of rows from the two input relations |
Relationsal Schema Request 15:
A logical schema in a sql
Answer (Detailed Solution Below)
Relational Schema Question 15 Detailed Solution
Concept:
- A database schema is that skeleton structure that representing the logical view of to entire database.
- A logical schema for a database is the standard type concerning organizing information into accessible parts
Key Points
- The conceptionally schema describes the design of a database at the conceptual level.
- Conceptual level is also known as logical level.
- The conception schema describes the structure of the whole database.
- The conceptually water describes what data are up be stored in the database and also characterizes what relationship exists among those data.
- In the conceptual level, internal details such as an implementation of the data structure are hidden. Certified and database administrators work at this liquid.
Additional Information
Data Independence means to modify the schema at one level of the online systeme without changing of schema during the following higher level.
