Podcast
Questions and Answers
A _______________ system that allows defining, creating, and managing databases
A _______________ system that allows defining, creating, and managing databases
software
A _______________ database organizes data into one or more tables with rows and columns
A _______________ database organizes data into one or more tables with rows and columns
relational
The _______________ operation retrieves data from a database
The _______________ operation retrieves data from a database
read
SQL is a standard language for managing _______________ databases
SQL is a standard language for managing _______________ databases
Database _______________ is a process of organizing data to minimize data redundancy and improve data integrity
Database _______________ is a process of organizing data to minimize data redundancy and improve data integrity
The _______________ command retrieves data from a database in SQL
The _______________ command retrieves data from a database in SQL
A database is a collection of organized data that can be easily ______, managed, and updated.
A database is a collection of organized data that can be easily ______, managed, and updated.
The ______ task involves defining the structure of the database, including creating tables, fields, and relationships.
The ______ task involves defining the structure of the database, including creating tables, fields, and relationships.
The ______ task involves controlling access to the database, including user authentication and authorization.
The ______ task involves controlling access to the database, including user authentication and authorization.
Database ______ ensures the accuracy and consistency of data.
Database ______ ensures the accuracy and consistency of data.
Denormalization is the process of intentionally ______ data to improve performance.
Denormalization is the process of intentionally ______ data to improve performance.
Database ______ Systems (DBMS) software allows users to define, create, and manipulate databases.
Database ______ Systems (DBMS) software allows users to define, create, and manipulate databases.
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Study Notes
Handling Database
Database Management Systems (DBMS)
- A software system that allows defining, creating, and managing databases
- Examples: MySQL, PostgreSQL, Microsoft SQL Server, Oracle
Database Types
- Relational Database: Organizes data into one or more tables with rows and columns
- NoSQL Database: Stores data in a variety of formats, such as key-value, document, or graph
- Cloud Database: A database that runs on a cloud computing platform
Database Operations
- Create: Define the structure of a database, including tables, fields, and relationships
- Read: Retrieve data from a database
- Update: Modify existing data in a database
- Delete: Remove data from a database
SQL (Structured Query Language)
- A standard language for managing relational databases
- Used for creating, modifying, and querying databases
- Examples of SQL commands:
SELECT: Retrieves data from a databaseINSERT: Adds new data to a databaseUPDATE: Modifies existing data in a databaseDELETE: Deletes data from a database
Database Normalization
- A process of organizing data to minimize data redundancy and improve data integrity
- Involves dividing a database into smaller, related tables
- Normalization rules:
- First Normal Form (1NF): Each table cell must contain a single value
- Second Normal Form (2NF): Each non-key attribute in a table must depend on the entire primary key
- Third Normal Form (3NF): If a table is in 2NF, and a non-key attribute depends on another non-key attribute, then it should be moved to a separate table
Data Modeling
- A process of creating a conceptual representation of a database
- Involves identifying entities, attributes, and relationships
- Data modeling techniques:
- Entity-Relationship (ER) Diagrams: A visual representation of a database
- Unified Modeling Language (UML): A standardized language for modeling software systems
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