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

Chapter 9

  1. You can combine literals, operators, and built-in functions in countless ways to produce expressions.
  2. A constant value such as a string, a number, or a NULL value.
  3. Perform math in your query.
  4. An important concept in mathematics is operator precedence, which means the order of operations. Precedence means that higher-level mathematical operations will be performed first so that multiplication and division are done before addition and subtraction. You can add parentheses around calculations to impact the precedence.
  1. String, numeric, and date.
  2. Converts text to lowercase.
  3. Converts a value into the specified data type.
  4. The query may no longer use the indexes on the table.
  5. STDDEV(column)
  6. Virtual and stored.