Introduction to Joins
Explore how to combine data from several tables using join and left join clauses. Learn to display specific columns, handle missing values, and apply aggregate functions like sum alongside group by to analyze relational data effectively.
We'll cover the following...
We'll cover the following...
In this chapter, we’ll learn about the join clause and how we can combine information that exists in more than one table. We can attach labels to column headers to make those headers easier to read. We’ll select to display specific columns from a wide result set and count distinct values to get accurate count results. We’ll also learn about the left join and how we can ...