Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

Analyze database contents using basic, intermediate and advanced SQL statement syntax and usage. Demonstrate capability to query data from multiple tables using SQL JOINS. Create and modify database ...

The simple answer is that many applications still call for the kinds of constraints, consistency, and safeguards that SQL databases provide. In those cases, some “advantages” of NoSQL may turn ...