Whether you are looking for examples to help you learn how to write your own queries or are looking for something ready-to-run, there is a very good chance that you will find something useful here. As a result of "evil-doers" we have had to suspend direct user contributions, so there is no need to register. You can search and view freely without a registration. Contributions and comments are welcome, however, so email then to querywiki@sosoft.com and we will post them for you.
Ready? Head for our Contents page to see a complete listing of what's here.
Here is an article that explains how to use the SOS-provided query tools, DBISQLC and DBISQLG for SOS Release 2009 and earlier:
http://www.sosoft.com/queries/how2010/
And another for Release 2010 and later:
http://www.sosoft.com/queries/how2009/
If you are looking for something a bit more visual to help you write your SQL queries, check out Flyspeed SQL Query. For $29 you really can't go wrong! http://www.activedbsoft.com/overview-querytool.html