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

Modifying the table structure

To modify the table structure, you need to use the ALTER TABLE command. This command also allows you to add, delete, and modify the table structure and other objects in the database.

Be careful when making schema changes, such as modifying the table structure. Dropping objects or columns causes data loss.

To use the scripts in this section, you can create a new database and table with the following scripts.

The first script creates a new database:

CREATE SCHEMA foraltering;

The next script creates a new table:

USE foraltering; 
CREATE TABLE tableforaltering (
playerID varchar(9) NOT NULL,
schoolID varchar(15) NULL,
yearID smallint NULL

The last script inserts the following data into the new table that we just created:

USE foraltering;
INSERT INTO tableforaltering
VALUES ('aardsda01','pennst',2001),