What are some SQL join exercises I can practice?

What are some SQL join exercises I can practice?

Here are a few SQL join exercises you can try: 1. Combine customer and order tables to find all orders made by each customer. 2. Use a left join to list all products and their corresponding sales, including products with no sales. 3. Create a query to find employees and their managers using self-join.

Can you explain the difference between inner join and left join?

Sure! An inner join returns only the rows that have matching values in both tables, while a left join returns all rows from the left table and the matched rows from the right table. If there's no match, the result is NULL on the side of the right table.

What SQL command would I use to perform a full outer join?

To perform a full outer join, you would use the SQL command: SELECT * FROM table1 FULL OUTER JOIN table2 ON table1.id = table2.id; This retrieves all records when there is a match in either left or right table records.

Can you give me a real-world example of using joins?

Absolutely! For instance, in an e-commerce database, you might join the 'customers' table with the 'orders' table to find out which customers have made purchases and what those purchases were.