Overview: SQL remains a core skill for data management across industries in 2026Free courses build fundamentals while paid ...

Many dismiss warehousing simply as storage. But they couldn’t be more wrong: a warehouse is a dynamic hub of activity that is the foundation of the entire ecommerce order fulfillment process. From ...

Q. Could you explain how the AGGREGATE function works in Excel? A. AGGREGATE is possibly the most versatile function in Excel. Think of it as an advanced version of the SUBTOTAL function that offers ...

Hello there! 👋 I'm Luca, a BI Developer with a passion for all things data, Proficient in Python, SQL and Power BI ...

select product_id,sum(amount) as "total sales" from sales group by product_id; select customer_id,sum(amount) as "total sales" from sales group by customer_id; ...

Elite economics PhD programs aim to train graduate students for a lifetime of academic research. This paper asks how advising affects graduate students’ post-PhD research productivity. Advising is ...

Even if generative AI hides SQL behind the curtain, it will continue to play a critical role in how we interact with and use data. In May 1974, Donald Chamberlin and Raymond Boyce published a paper on ...

An aggregate function error in SQL occurs when you try to use an aggregate function in a way unsupported by the SQL language. You may experience the error if you do ...