Count Me In: SQL Aggregates Explained
In this video, we’ll break down the difference between COUNT(*) and COUNT(column) in SQL, two commonly used functions for counting rows in a table. If you're working with databases or learning SQL, understanding the distinction between these two is essential. You’ll learn:
What COUNT(*) does and how it counts all rows, including NULLs.
How COUNT(column) only counts non-NULL values in a specific column.
When to use COUNT(*) versus COUNT(column) in real-world queries.
Examples and practical use cases to solidify your understanding.
By the end of this tutorial, you’ll know which counting method is best for different scenarios, making your SQL queries more efficient and accurate.
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