SQL Queries For Mere Mortals: A Hands-On Guide to Data Manipulation in SQLViescas, J. L. (2018). SQL queries for mere mortals: A hands-on guide to data manipulation in SQL (4th ed.). Addison-Wesley/Pearson Education.
Read Chapter 4: Creating a Simple Query.
This chapter describes how to create a simple query using SQL SELECT statements to find records in the database based on specific criteria.
Read Chapter 8: Inner Joins.
This chapter explains what a JOIN statement is and how this query technique is used to select data from more than one table in the database.
Read Chapter 13: Grouping Data.
This chapter details how to use SELECT and GROUP BY and aggregate functions to select data tables in the database.