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Introduction to the SQL Database Query

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This lesson teaches the reader the fundamentals of the SQL SELECT statement, which is used to query the database for useful information. The database user has many options with the SELECT statement, proving that the query is the most robust feature of SQL.

See a sample chapter from latest edition of Sams Teach Yourself SQL in 24 Hours, 6th Edition Summarizing Data Results from a Query in SQL.

This chapter is from the book

In this seventh hour, you will learn about database queries, which involve the use of the SELECT statement. The SELECT statement is the most frequently used of all SQL commands after a database's establishment. The SELECT statement allows you to view data that is stored in the database.

The highlights of this hour include

  • What a database query is

  • How to use the SELECT statement

  • Adding conditions to queries using the WHERE clause

  • Using column aliases

  • Selecting data from another user's table

What Is a Query?

A query is an inquiry into the database using the SELECT statement. A query is used to extract data from the database in a readable format according to the user's request. For instance, if you have an employee table, you might issue a SQL statement that returns the employee who is paid the most. This request to the database for usable employee information is a typical query that can be performed in a relational database.

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