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 ...

This relationship upgrade allows for coherent SQL statements to retrieve valid information ... requires joining the associative table with the original “many” tables. For example, to find all courses ...

I'm scratching out a schema for a set of data that has two objects that can be added (one-to-many) to multiple unrelated object types. Example ... of doing this in SQL, I'm trying to make ...