Merging Data from Multiple Tables
Understand how to merge data from separate tables using SQL joins. This lesson helps you filter data effectively by using related columns and avoid incorrect results caused by Cartesian products. You will learn to write precise join conditions to combine tables and retrieve accurate datasets.
We'll cover the following...
Navigating data retrieval challenges
The data has been divided into two tables, which presents a new challenge: How do we retrieve it? Is there a way to restore our original information somehow? It should be easy, no? Let’s try it out!
But before we do that, let’s take a smaller subset of records from these two tables. It will help in developing a better understanding of the involved concepts.
We used the subset of SalesData and Product table as given in the above illustration. Let’s now write a query to generate the result set.