On the most basic level, the way we learned to query through a table in one of our databases is pretty simple.
The SQL SELECT statement allows us to search through a table and return a custom results table with whatever columns/groupings/operations we specified in our query.
SELECT * FROM movies WHERE rottentomatoes > 85 AND lead_actor like 'Kevin Spacey';
Unfortunately, sometimes the queries need an added level of complexity and a simple statement like the one above wont do the trick. Here are two scenarios where we need to add some intricacy to our SQL statement in order to perform a sufficient query:
- We want to query for consistencies between two separate tables that are connected through a reference key.