Suppose that Office 2016 Pro Plus (MS ActionPack, MSDN subscription etc.) is installed on your PC but you still need to add some language support. In my case, I need to add the Russian proof tools to the English Office that includes already the French language support but doesn't contain any Cyrillic spell checking.
Les Etats-Unis... sont la seule et unique hyperpuissance. Elle est prédominante dans tous les domaines : économique, technologique, militaire, monétaire, linguistique, culturel. Cette situation est sans précédent
Hubert Védrine, Ministre des Affaires étrangères de la République Française, 2000 (1)
Some correspondences between Microsoft operating systems (wiki DOS, Win) and Star Wars movies (wiki).
As you can see, the glorious and victorious episodes 6 and 3 are the most stimulating for Windows production but when old versions are Jedi-inspired, the recent versions are on the dark side of the Force.
Better to see once than to hear a hundred times. This small article explains what are the different kinds of joins in SQL.
At the first time you should take into account that SQL is a declarative 4th generation language. So the best way to use it (especially for beginners) is to write the query and let SQL optimizer do its job. That means thinking in set-oriented terms and avoiding sub-queries.
Let's take two example tables: Companies and Contacts.