Summary  
Demonstrates how to sort query results by multiple columns in a specified priority order using a single ORDER BY clause.

General domain of usage  
Relational database querying

We can also sort by multiple columns. We need to specify the column names **separated by commas**. 

The first column specified in the sorting will have **priority**, and then the sorting will proceed according to the second column.

The syntax will look like this:

```sql
SELECT columns 
FROM table 
ORDER BY column_with_priority, column2, ...
```

Let’s look at the example that retrieves three columns and sorts the results by two of them: first by `population` and then by `capital`:

SELECT ID, population, capital 
FROM country 
ORDER BY population, capital;

Which SQL clause is used to sort query results by multiple columns?

This course is perfect for beginners ready to explore the world of SQL. Whether you're just starting out in database management or aiming to use SQL for your application development projects, this course covers the essentials. You'll quickly learn how to leverage the full potential of SQL, from querying and managing data to seamlessly integrating it into real-world applications. By the end of the course, you'll have the confidence and skills to solve practical problems with SQL and enhance your development process.

In this section, we will learn how to use the SQL SELECT statement to get a single table column, multiple table columns, and all table columns. We will also find out how to return unique values.

In this section, we’ll explore how to organize and prioritize the data returned by a query using the ORDER BY clause. Placed at the end of a SELECT statement, this clause lets you sort your results by one or multiple columns, either in ascending or descending order, enabling more meaningful and easily interpretable data output.

In this section, we will learn how to filter returned data using the SELECT statement's WHERE clause. We will learn how to test for equality, inequality, more and less significant than value ranges, and NULL values.

In this section, we’ll explore how to refine your search conditions by combining WHERE clauses with the AND and OR operators. We’ll also cover how the NOT operator can be used to exclude certain results.

In this section, we will learn what the SQL aggregate functions are and how to use them to summarize table data.

Sorting by Multiple Columns