Subqueries Courses
Codecademy Google BigQuery & PostgreSQL : Big Query for Data Analysis
Udemy Get Started Querying with Transact-SQL
Microsoft via Microsoft Learn SQL: Using Joins, Constraints, Normalization, and Subqueries (Interactive)
Pluralsight Java Data Access - SQL Primer
LearnQuest via Coursera Oracle SQL Exam Prep
LearnQuest via Coursera The Structured Query Language (SQL)
University of Colorado Boulder via Coursera Microsoft SQL Server 2012 Certification Training Exam 70-461
Udemy Microsoft Access SQL: SQL for Non-Programmers
Udemy Master SQL For Data Science
Udemy