Summary  
This chapter covers using the DISTINCT keyword in SELECT statements to retrieve unique values by filtering out duplicates.

General domain of usage  
Relational database querying

Note that the `SELECT` statement returns all rows in a given column. However, what if we don't need all the values from a column, especially when they are duplicated, and we only need **unique values**? 

For such cases, it is convenient to use the keyword `DISTINCT`, placed immediately before the column names. Let's take a look at an example:

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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.

Retrieving Distinct Rows

Solution

Awesome!

Retrieving Distinct Rows

Solution

Awesome!