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 ...

Normalized data giving you problems? Learn how to use the SQL subselect statement and handle your database like a pro!

First of all, a recursive query is implemented using the WITH clause (using a CTE). The CTE is named EXPL. The first SELECT primes the pump to initialize the “root” of the search. In our case, to ...