Summary  
This chapter explains how to use the AND logical operator in a SQL WHERE clause to filter query results based on multiple conditions simultaneously.

General domain of usage  
Relational database querying

When you want to filter results using more than one column, you can chain conditions together with the `AND` operator in the `WHERE` clause. 

SELECT name, population, region
FROM country
WHERE population >= 1000000 AND continent ='Europe';

This query returns only the rows that meet both conditions: the country's population is at least 1000000, and it's located in Europe.

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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.

Using the AND Operator

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