Book Image

Learn SQL Database Programming

By : Josephine Bush
5 (1)
Book Image

Learn SQL Database Programming

5 (1)
By: Josephine Bush

Overview of this book

SQL is a powerful querying language that's used to store, manipulate, and retrieve data, and it is one of the most popular languages used by developers to query and analyze data efficiently. If you're looking for a comprehensive introduction to SQL, Learn SQL Database Programming will help you to get up to speed with using SQL to streamline your work in no time. Starting with an overview of relational database management systems, this book will show you how to set up and use MySQL Workbench and design a database using practical examples. You'll also discover how to query and manipulate data with SQL programming using MySQL Workbench. As you advance, you’ll create a database, query single and multiple tables, and modify data using SQL querying. This SQL book covers advanced SQL techniques, including aggregate functions, flow control statements, error handling, and subqueries, and helps you process your data to present your findings. Finally, you’ll implement best practices for writing SQL and designing indexes and tables. By the end of this SQL programming book, you’ll have gained the confidence to use SQL queries to retrieve and manipulate data.
Table of Contents (24 chapters)
Section 1: Database Fundamentals
Section 2: Basic SQL Querying
Section 3: Advanced SQL Querying
Section 4: Presenting Your Findings
Section 5: SQL Best Practices

Deleting data from tables

To remove data that you've previously inserted into your database, you need to use the DELETE statement. You can delete all the records from a table, or use a WHERE clause to delete only some of the records from a table.

Using the DELETE statement with a WHERE clause

To avoid deleting everything from your table, you can use the WHERE clause with your DELETE statement. To delete data from a table in MySQL, use the following syntax:

DELETE FROM lahmansbaseballdb.collegeplaying
WHERE <{where_expression}>;

You can get this syntax by taking the following steps:

  1. Right-click on Tables in MySQL Workbench.
  2. Select Send to SQL Editor.
  3. Then, select Delete Statement.

This places the DELETE syntax...