Databases: storing and searching information

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What is a Database?

A database is an organised collection of data, like a digital filing cabinet.
A DBMS (Database Management System) is the software used to create, manage, and search databases.
Examples of DBMS: MySQL, Microsoft SQL Server, Oracle, and IBM Db2.
Databases can be small (on a single computer) or huge (on cloud servers).
They are better than long lists because they allow fast searching and sorting.

Key Terms: Tables, Records, and Fields

A table stores data about one type of thing, e.g., students or books.
A record is a single row in a table – it holds all data about one item.
A field is a column in a table – it holds one piece of data for every record.
Example: a 'Students' table has fields like Name, Age, and Class.
Each record is unique, often identified by a primary key.

Why Use a Database?

Databases can handle large amounts of data efficiently.
They allow quick searching – finding a record in seconds.
They support sorting – putting data in order (e.g., alphabetical).
Multiple users can access the same data at the same time.
Data is consistent and less likely to be duplicated.

Searching and Sorting with Queries

A query is a request for specific data from a database.
Queries can filter records using conditions (e.g., Age > 12).
Queries can sort results (e.g., by surname).
SQL (Structured Query Language) is the most common query language.
Example SQL: SELECT×FROM Students WHERE Age = 13;

Data Types and Validation

Each field has a data type – e.g., text, number, date, or boolean.
Data types help keep data accurate (e.g., you can't put letters in a number field).
Validation rules check data before it is entered.
Examples: a date must be in a valid format, or a number must be within a range.
Validation reduces errors and keeps the database reliable.

A lookup check accepts a value only when it appears in an approved list of choices.

Everyday Database Examples

School systems store student details, attendance, and grades.
Online shops use databases for products, customers, and orders.
Libraries use databases to track books and borrowers.
Social media platforms store user profiles and posts.
Hospitals store patient records and appointments.

Database Models

The relational model organises data into tables with rows and columns.
Relational databases use SQL and are the most common today.
NoSQL databases are non-relational and use different query methods.
Early models used pointers to link records (hierarchical and network).
The relational model was invented by Edgar F. Codd in 1970.

Database Management Systems (DBMS)

A DBMS lets users enter, store, and retrieve data.
It provides security – only authorised users can access data.
It manages concurrency – many users can use the database at once.
It helps backup and recover data if something goes wrong.
The DBMS and database together are called a database system.

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練習問題

無料プレビュー — 49問中8問。すべて見るには登録を。

1.What is a database?
Easy
- AAn organized collection of data
- BA type of computer virus
- CA programming language
- DA hardware device for storage
2.A database management system (DBMS) is software that allows users to interact with the database and manage the data.
Easy
True or false?
3.Complete the sentence with the correct term.
Easy
In a relational database, data is organized into ____ and columns in a series of tables.
4.Which of the following is an example of a relational database management system?
Easy
- AMySQL
- BMagnetic tape
- CNoSQL
- DSpreadsheet
5.What does SQL stand for?
Medium
6.Which of the following is a function of a database management system (DBMS)?
Medium
- AData definition
- BCreating computer graphics
- CSending emails
- DCompiling code
7.Which of the following are components of a database system? (Select all that apply)
Medium
- ADatabase
- BDatabase management system (DBMS)
- CKeyboard
- DAssociated applications
8.In which year was the relational model first proposed by Edgar F. Codd?
Medium

もっと問題

9.In the relational model, applications search for data by following links rather than by content.
Easy
True or false?
10.Which of the following is a key advantage of using a database management system over a simple list?
Medium
- AIt allows efficient searching and sorting of large amounts of data
- BIt takes up less physical space than paper
- CIt automatically creates charts and graphs
- DIt can store data without any software
11.What is the term for the software that interacts with end users, applications, and the database itself to capture and analyze data?
Medium
12.Match each database-related term to its correct description.
Medium
- Database
- DBMS
- SQL
- Software for managing databases
- An organized collection of data
- A query language for relational databases
13.Arrange the following database development eras in chronological order, starting from the earliest.
Medium
- SQL/relational
- Navigational
- Post-relational
14.Complete the sentence with the correct term.
Easy
In a database, a ____ is a single piece of information about an entity, while a ____ is a collection of fields about one entity.
15.Which of the following best describes a NoSQL database?
Hard
- AA database that uses a non-relational model and different query languages
- BA database that only stores numbers
- CA database that does not use a DBMS
- DA database that is not organized
16.The term 'database' is only used to refer to the database management system, not the data itself.
Medium
True or false?
17.Explain why the relational model was a significant departure from earlier navigational models.
Hard
18.Complete the sentence about database administration.
Medium
Database administration involves registering users, enforcing data security, monitoring performance, and maintaining data ____.
19.Which of the following is a common use of a database in everyday life?
Medium
- AA library catalog system
- BA word processing document
- CA paper address book
- DA calculator
20.Which of the following are functions of a DBMS? (Select all that apply)
Hard
- AData definition
- BData retrieval
- CData deletion
- DData encryption
- EData visualization
21.What term is used for a collection of related data accessed through a DBMS?
Easy
22.Large databases are often hosted on computer clusters or cloud storage.
Medium
True or false?
23.Complete the sentence with the correct term.
Medium
The two main early navigational data models were the hierarchical model and the ____ model.
24.Which of the following is a reason why relational databases became dominant by the early 1990s?
Hard
- AThey are easier to use than navigational models because they search by content
- BThey are faster than any other type of database
- CThey require no hardware
- DThey are the only databases that can store text
25.Describe two ways that database technology has evolved over time, and explain how each change improved data management.
Challenge
26.Match each database model to its characteristic.
Medium
- Relational
- Navigational
- NoSQL
- Uses pointers to follow relationships
- Uses tables with rows and columns
- Uses different query languages
27.Arrange the following steps in the order they would typically occur when using a database: first to last.
Medium
- Define data structures
- Enter data
- Query data
- Administer users
28.The relational model was proposed in 1970 but only became widely deployed in the mid-1980s due to hardware limitations.
Medium
True or false?
29.Complete the sentence with the correct term.
Medium
The process of selecting data according to specified criteria is called ____.
30.Which of the following is an example of a database validation technique to keep data accurate?
Hard
- AChecking that a date is in the correct format
- BDeleting old records
- CSorting data alphabetically
- DCreating a backup
31.What is the name for the software that runs on dedicated computers and holds the actual databases?
Medium
32.Which of the following are factors that databases and DBMSs can be categorized by? (Select all that apply)
Hard
- AThe database model they support
- BThe type of computer they run on
- CThe query language used
- DThe color of the interface
- ETheir internal engineering
33.In what decade did relational databases become dominant? (Enter the decade as a number, e.g., 1980s as 1980)
Easy
34.A database system includes the database model, the DBMS, and the database itself.
Medium
True or false?
35.Complete the sentence with the correct term.
Medium
The dominant database language for the relational model is ____.
36.Which of the following is a characteristic of a NoSQL database?
Medium
- AIt uses SQL for querying
- BIt is non-relational and uses different query languages
- CIt is always faster than relational databases
- DIt cannot handle large amounts of data
37.Explain how the emergence of direct access storage media such as magnetic disks enabled the concept of a database.
Challenge
38.Arrange the following database management functions in the order they would typically be performed when creating and using a database: first to last.
Medium
- Data definition
- Data updates
- Data retrieval
- Database administration
39.The term 'database' is often used loosely to refer to any collection of related data, such as a spreadsheet or card index.
Hard
True or false?
40.Complete the sentence with the correct term.
Medium
A database management system provides functions for entry, storage, and ____ of large quantities of information.
41.Which of the following is a reason why a database is better than a long list for storing information?
Medium
- AIt allows efficient searching and sorting of large amounts of data
- BIt takes up less physical space than paper
- CIt automatically creates charts and graphs
- DIt can store data without any software
42.Which of the following are examples of database management systems mentioned in the source? (Select all that apply)
Hard
- AIBM Db2
- BOracle
- CMySQL
- DMicrosoft SQL Server
- EMicrosoft Excel
43.What is the term for the database model that uses tables with rows and columns?
Medium
44.The DBMS provides ways to manage how information is organized.
Medium
True or false?
45.Complete the sentence with the correct term.
Medium
The development of database technology can be divided into three eras based on data model: navigational, ____, and post-relational.
46.Which of the following is a challenge that database systems address according to the source?
Hard
- ASupporting concurrent access
- BCreating visual presentations
- CGenerating random numbers
- DDesigning web pages
47.Explain the difference between a database and a database management system (DBMS).
Hard
48.In which year was the relational model first proposed by Edgar F. Codd?
Medium
- A2364
- B1773
- C2167
- D1970
49.In what decade did relational databases become dominant? (Enter the decade as a number, e.g., 1980s as 1980)
Easy
- A1980
- B2178
- C1782
- D2376

復習ノート

## Databases: Storing and Searching Information A **database** is an organized collection of data, managed by a **Database Management System (DBMS)** – software that lets users and applications interact with the data. The database, DBMS, and associated applications together form a **database system**. ### Why Use a Database? Databases beat long lists (like spreadsheets) because they allow efficient storage, retrieval, and management of large amounts of data. They support multiple users, enforce data integrity, and provide powerful search and sorting capabilities. ### Key Concepts - **Tables, Records, and Fields**: Data is organized into tables (like spreadsheets). Each row is a **record** (a single item), and each column is a **field** (a specific attribute). - **Queries**: Queries are used to search and sort data based on specified criteria. For example, find all students with a grade above 80. - **Data Types and Validation**: Each field has a data type (e.g., text, number, date). Validation rules (e.g., age must be between 0 and 120) help keep data accurate. - **Database Models**: The most common is the **relational model**, where data is stored in tables with relationships. SQL is the standard language for querying relational databases. NoSQL databases (non-relational) emerged in the 2000s for different needs. ### How Databases Work - **Data Definition**: Creating and modifying the structure (tables, fields). - **Updates**: Adding, changing, or deleting records. - **Retrieval**: Selecting data based on criteria (queries). - **Administration**: Managing users, security, performance, and data integrity. ### Everyday Examples Databases are everywhere: school records, library catalogs, online shops, and social media. They store and retrieve information quickly and reliably. ### Key Terms - **DBMS**: Software that manages a database. - **Relational Database**: Data in tables with relationships, using SQL. - **SQL**: Standard query language for relational databases. - **NoSQL**: Non-relational databases with different query languages. - **Record**: A row in a table. - **Field**: A column in a table. - **Query**: A request for data based on criteria. - **Validation**: Rules to keep data accurate. Remember: Databases are powerful tools for organizing and searching information efficiently.

Database: An organized collection of data, typically managed by a DBMS.
DBMS (Database Management System): Software that allows users to interact with a database, providing functions for data definition, updates, retrieval, and administration.
Relational Database: A database model that organizes data into tables with rows and columns, using SQL for queries.
SQL: Structured Query Language, the standard language for writing and querying relational databases.
NoSQL: A collective term for non-relational databases that use different query languages, popular since the 2000s.
Record: A row in a database table, representing a single entity or item.
Field: A column in a database table, representing a specific attribute of the records.
Query: A request to retrieve or manipulate data based on specified criteria.
Validation: Rules applied to fields to ensure data accuracy, such as checking that a date is in the correct format.

フラッシュカード

What is a database?

An organized collection of data, typically stored and accessed electronically, managed by a database management system (DBMS).

What does DBMS stand for?

Database Management System – the software that interacts with users, applications, and the database to capture and analyze data.

Name three components that make up a database system.

The database itself, the DBMS, and associated applications.

What is a table in a relational database?

A set of data organized into rows and columns, where each row is a record and each column is a field.

Define 'record' in the context of databases.

A single row in a table that contains data about one specific item or entity, made up of fields.

Define 'field' in the context of databases.

A column in a table that holds a specific type of data for each record, such as a name or age.

Why use a database instead of a long list or spreadsheet?

Databases can handle large amounts of data efficiently, allow complex queries, reduce data redundancy, and maintain data integrity.

What is a query in a database?

A request to retrieve or manipulate data based on specific criteria, often written in SQL.

What does SQL stand for?

Structured Query Language – the standard language for writing and querying relational databases.

Name three common data types used in databases.

Text (or string), number (integer or decimal), and date/time.

What is data validation?

Rules applied to fields to ensure data is accurate and reasonable, like checking that a date is in the correct format or an age is positive.

Give an example of a validation rule for an 'Age' field.

Age must be a number between 0 and 120.

What is sorting in a database?

Arranging records in a specific order, such as alphabetical or numerical, based on one or more fields.

What is filtering in a database?

Displaying only records that meet certain criteria, using a query or filter condition.

What is a primary key?

A field (or combination of fields) that uniquely identifies each record in a table, ensuring no duplicates.

Why is a primary key important?

It ensures each record can be uniquely identified, which is essential for efficient searching and linking tables.

What is a relational database?

A database that organizes data into multiple tables that are linked by common fields, using the relational model.

Who proposed the relational model and when?

Edgar F. Codd in 1970.

What is NoSQL?

A category of non-relational databases that use different query languages and are designed for large-scale, flexible data storage.

Give two examples of relational database management systems.

MySQL and Microsoft SQL Server (also Oracle, IBM Db2).

What is a database management system (DBMS) used for?

To create, manage, and manipulate databases, including data definition, updates, retrieval, and administration.

What is data integrity?

The accuracy and consistency of data stored in a database, maintained through constraints and validation.

Name one everyday example of a database.

A school's student records system, a library catalog, or a phone contact list.

What is the difference between a database and a DBMS?

A database is the collection of data itself, while a DBMS is the software used to manage and interact with that data.

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