Mastering SQL Joins – INNER, LEFT, RIGHT, and FULL OUTER Explained
Learn how to combine data from multiple tables using SQL Joins. Discover the differences between INNER, LEFT, RIGHT, and FULL OUTER joins and when to use each. SQL JOIN Types Visualization INNER JOIN Returns only the matching records from both tables where the join condition is met. LEFT JOIN Returns all records from the left […]
Grouping Data in SQL – Using GROUP BY and HAVING
Learn how to aggregate and summarize your data using the GROUP BY clause, and refine your groups with the HAVING clause in SQL. Introduction When working with large datasets, simply retrieving individual rows is often not enough. You need to summarize and analyze your data by grouping similar records together. In SQL, the GROUP BY […]
Sorting Data with ORDER BY – Organize Your Results
Learn how to effectively organize your query results using the ORDER BY clause in SQL. Introduction Once you’ve learned how to select and filter data using the SELECT statement and the WHERE clause, the next step is to present your data in a logical order. The ORDER BY clause is your tool for arranging query […]
How to Write a Basic SQL SELECT Statement
Learn the foundation of SQL querying with a clear, step-by-step guide on writing a basic SELECT statement. Introduction The SELECT statement is the backbone of SQL queries. It allows you to retrieve specific data from one or more tables, making it an essential tool for anyone working with databases. In this article, you’ll learn: If […]
Filtering Data in SQL – Mastering the WHERE Clause
Learn how to refine your SQL queries with the powerful WHERE clause and get exactly the data you need. Introduction When working with databases, retrieving data quickly is only half the battle—you also need to extract the precise subset of data that matters. This is where the WHERE clause comes in. In this guide, we’ll […]
SQL 101: What Is SQL and Why It Matters
Learn the fundamentals of Structured Query Language (SQL) and discover why it’s the backbone of modern data management. Introduction Have you ever wondered how vast amounts of data—from customer records to sales figures—are stored, managed, and made meaningful? The answer lies in SQL. Whether you’re completely new to databases or looking to refresh your knowledge, […]
Excel test in interview: how to prepare + tips to pass
Do you have an Excel assessment test planned for a job application? Discover 15 tips to prepare and pass the test. Learn how to answer Excel most common questions during interviews.
Date functions and formulas in Excel
7 Excel date formulas explained for beginner to intermediate levels: TODAY, NOW, ISOWEEKNUM, SUMIFS, etc. Get ready to learn with the help of Ted Jordan.
How to split semicolon separated values in Excel
Split semicolon separated values in Excel into columns and rows, or convert columns to semicolon separated values, like an Excel Master!
How to save and reuse custom theme in Excel
Save and reuse custom theme in Excel with ease by following our quick tutorial.
