This repository demonstrates a common SQL error: using an aggregate function (like COUNT(*)) in a subquery within the FROM clause without a corresponding GROUP BY ...

This repository demonstrates a common SQL error where a subquery or a user-defined function in the WHERE clause returns multiple rows instead of a single boolean ...

SQL Window functions are an advanced type of function in SQL. In this post, you will learn about what SQL window functions are and how they can be used or work. What are SQL window functions? SQL ...