Summary  
This chapter explains how to use SQL SELECT statements to specify columns, apply filters, and retrieve targeted records from relational tables.  

General domain of usage  
Relational databases

## Let's Quickly Summarize

Retrieving data in SQL means using the **SELECT** statement to query tables and get the information you need from a database. You use **SELECT** to choose which columns to view, apply conditions to filter the results, and focus on specific records. This process helps you extract exactly the data you want, whether it's a single value or many rows, from one or more tables in the database.

What SQL statement is used to retrieve data from a database?

Which clause is used to filter rows returned by a SELECT statement?

How do you limit the number of rows returned by a query in SQL?

Which SQL keyword allows you to select distinct values only?

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.

Retrieving Data Summary

Let's Quickly Summarize

1. What SQL statement is used to retrieve data from a database?

2. Which clause is used to filter rows returned by a SELECT statement?

3. How do you limit the number of rows returned by a query in SQL?

4. Which SQL keyword allows you to select distinct values only?