Podcast
Questions and Answers
What is the main purpose of a Database Management System (DBMS)?
What is the main purpose of a Database Management System (DBMS)?
What is an entity in a database?
What is an entity in a database?
What is the primary function of data cleaning or data scrubbing?
What is the primary function of data cleaning or data scrubbing?
What is the primary purpose of a Data Administrator?
What is the primary purpose of a Data Administrator?
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What is a Data Warehouse?
What is a Data Warehouse?
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What is SQL?
What is SQL?
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What is a Data Mart?
What is a Data Mart?
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What is Database as a Service (DaaS)?
What is Database as a Service (DaaS)?
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Study Notes
Database Fundamentals
- A database is an organized collection of data.
- A database management system (DBMS) is a group of programs that manipulate the database and provide an interface between the database and its users and other application programs.
Database Concepts
- An entity is a person, place, or thing for which data is collected, stored, and maintained.
- An attribute is a characteristic of an entity.
- A data item is the specific value of an attribute.
Data Modeling
- A data model is a diagram of data entities and their relationships.
- Entity-relationship (ER) diagrams are data models that use basic graphical symbols to show the organization of and relationships between data.
Relational Database Model
- The relational database model is a useful way to organize data into a collection of two-dimensional tables called relations.
- A primary key is a field or set of fields that uniquely identifies the record.
Database Operations
- Selecting involves eliminating rows according to certain criteria.
- Projecting involves eliminating columns in a table.
- Data cleaning or data scrubbing is the process of detecting and then correcting or deleting incomplete, incorrect, inaccurate, or irrelevant records that reside in a database.
Database Languages
- SQL (Structured Query Language) is a special-purpose programming language for accessing and manipulating data stored in a relational database.
Database Administration
- A data administrator is a nontechnical position responsible for defining and implementing consistent principles for a variety of data issues.
- The data administrator sets data standards and data definitions that apply across all the databases in an organization.
Database Services
- Database as a Service (DaaS) is a service where the database is stored on a service provider's servers, and accessed by the client over a network, typically the Internet.
Data Warehousing
- A data warehouse is a large database that collects business information from many sources in the enterprise in support of management decision making.
- A data mart is a subset of a data warehouse that is used by small- and medium-sized businesses and departments within large companies to support decision making.
NoSQL Database
- A NoSQL database provides a means to store and retrieve data that is modeled using some means other than the simple two-dimensional tabular relations used in relational databases.
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Description
Test your knowledge of database basics, including database management systems, entities, attributes, and data models.
