SQL JOINS: A Beginner Guide to Data Analysis using SQL

Why use SQL JOIN?
You’re in a business that accumulates data, and to get a clear view, you need to understand what this data means. There are often duplicate entries in your data, and SQL JOIN clauses will help you find the relevant data you need. Using SQL JOIN clauses is perfect for combining rows from two or more tables and the common fields behind them.How do SQL joins work?

What are the common SQL JOIN types?
1. INNER JOIN



2. LEFT JOIN



3. RIGHT JOIN



4. FULL OUTER JOIN



Summary
These are the most common SQL JOIN types you’ll likely encounter and need. Before making a query, think about your data, the different scenarios and results you’d like to have and which SQL JOIN clause you should use. As short summary the chart below visualizes the different joins.