📄️ Using the JOIN Clause
In SQL, the JOIN clause is used to combine rows from two or more tables, based on a related column between them. It's a powerful tool to consolidate data and create more complex queries. In this tutorial, we will be focusing on how to use the JOIN clause effectively in SQL.
📄️ Grouping Data with the GROUP BY Clause
In SQL, grouping data is an important task that helps in organizing similar data into groups. This is often used with aggregate functions (COUNT, MAX, MIN, SUM, AVG) to group the data according to the values of certain columns and then perform an operation on each group. The GROUP BY clause is used for this purpose.
📄️ Using Subqueries
Introduction