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Ordering
3. Sort the rows – ORDER BY
Limiting the output
Eliminating duplicate results
Aggregation
Grouping
HAVING: filtering and ordering groups
Let's practice

## Instruction

Good, let's get down to work.

You're already pretty skilled when it comes to filtering rows – but have you wondered how they are sorted in the result of an SQL query? Well, the answer is simple – by default, they are not sorted at all. The sequence in which rows appear is arbitrary and every database can behave differently. You can even perform the same SQL instruction a few times and get a different order each time – unless you ask the database to sort the rows, of course.

SELECT *
FROM orders
ORDER BY customer_id;


In the above example, we've added a new piece: ORDER BY. After this expression, you can simply specify a column on which the data will be sorted.

In this case, we want to sort by the customers' IDs, so we put customer_id in the ORDER BY clause.

## Exercise

Try it yourself. Select all columns from the employees table, and sort the result by the salary.

### Stuck? Here's a hint!

Type:

SELECT *
FROM employees
ORDER BY salary;