Learn how to use SQL to group data by one or more criteria, apply aggregate functions, ... For example, if you have a table of sales data with columns for product, region, ...

Example: Using GROUP BY in SQL. Consider a table named “sales” that stores information about sales transactions. The table has the following columns: ...

It is a SQL practice repository covering basics to advanced topics. It includes exercises on SELECT statements, WHERE clauses, GROUP BY, JOINS, window functions (OVER(), PARTITION BY), ROW_NUMBER(), ...

For example, if we want to explore the data set of customers who bought products from an online store, we can use SQL to calculate the mean, median, standard deviation, and range of the order ...

SQL is the standard language for dealing with Relational Databases. SQL can be used to insert, search, update, and delete database records. SQL can do lots of other operations, including optimizing ...

SQL (Structured Query Language) has been with us for more than half a century and it’s not going away anytime soon. Popular in both traditional relational databases and newer NoSQL databases ...

Abstract: Formulating database queries in terms of SQL is often a challenge for journalists, business administrators, and the growing number of non-database experts that are required to access and ...