TechCommanders "Techie Tips" Blog
Central tendency is a statistical measure that represents the middle or most typical value of a dataset. It is a way of summarizing a set of data with a single value that helps to describe the overall distribution of the data.
The best measure of central tendency to select when providing a...
A leading space is a blank space that appears before the first character of a string of text. A trailing space is a blank space that appears after the last character of a string of text.
Leading and trailing spaces are often considered to be unnecessary and can cause problems with data...
Structured data and semi-structured data are two types of data that differ in their organization and format.
Structured data is highly organized and adheres to a predefined format, typically stored in relational databases.
It is characterized by fixed fields, consistent data types, and...
Online analytical processing (OLAP) and online transaction processing (OLTP) are two different types of database systems that are designed for different purposes.
OLTP systems are designed to handle a high volume of transactions in real time. They are typically used for applications such as...
A data cube, also known as an OLAP (online analytical processing) cube or business intelligence cube, is a multidimensional data structure that is optimized for fast and efficient analysis of large datasets.
It is typically used to store and analyze data from a data warehouse or data mart.
Key...
A snowflake schema is a logical arrangement of tables in a multidimensional database such that the entity relationship diagram resembles a snowflake shape.
It is an extension of the star schema, where dimension tables are broken down into subdimensions. Snowflake schemas are commonly used...
A data lake is a centralized repository that stores a vast amount of data in its native format. This means that it can store structured, semi-structured, and unstructured data, such as text, images, videos, and audio.
Data lakes are often used to store big data, which is data that...
A data mart is a subset of a data warehouse that is designed to serve the specific needs of a particular department or user group within an organization. It is typically focused on a specific subject area, such as sales, customers, or products, and it contains data that is relevant to that...
A data warehouse is a centralized repository of data that is specifically designed for analysis and decision support.
It collects data from multiple sources, including transactional databases, external data feeds, and other data sources, and stores it in a structured format.
The data is then...
A relational database is a type of database that stores data in tables. Tables are made up of rows and columns, and each row represents a single record of data. Each column represents a specific attribute of the data, such as a name, an address, or a price.
Relational databases are so named...
What should you do if your a marketing company with tons of data (aka in the data world at least petabytes of data:)
NoSQL databases are designed to store large amounts of unstructured data, such as social media posts, comments, and images. They are also highly scalable, which means that...
Preparing for the CompTIA Data Plus certification. Make sure you get data modeling and its types!
Data modeling is the process of creating a schema for a database.
A schema is a blueprint for a database that describes the structure of the data, including the tables, columns, and...
