Welcome to Introduction to SQL with Videos, a beginner-friendly course designed to teach you the foundational skills of Structured Query Language (SQL)—the standard language for managing and manipulating relational databases. Whether you’re aspiring to become a data analyst, software developer, or data engineer, SQL is an essential tool in your toolkit. This course combines clear, concise video lessons with hands-on practice to help you learn how to query databases, filter and sort data, perform joins, and much more. No prior experience is required—just a willingness to learn and explore the language of data.
Why You Need SQL LEFT OUTER JOINS In real-world data, relationships between entities are often not guaranteed to exist for every record. Consider a situation where you want to analyze customer behavior in an e-commerce system. Some customers may have placed orders; others may have simply registered but never purchased. How do you write a […]
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Why SQL HAVING Is Different from WHERE When writing SQL queries, two commonly used clauses for filtering data are WHERE and HAVING. At first glance, they may appear to serve the same purpose—filtering rows from a dataset. However, they are used in very different ways and operate at distinct stages of SQL’s internal processing flow.
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How to write NOT EQUAL in SQL In Structured Query Language (SQL), comparison operators are essential for filtering data based on conditions. One of the most commonly used is the “not equal” operator, which checks whether two values are different. While this seems straightforward, SQL provides multiple ways to express inequality — and not all
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