Is there a comprehensive list of Rally Field names, operators and values? i.e. Project is actually Project.Name in a SQL query.
I just came across this yesterday while working on queries, https://rally1.rallydev.com/slm/doc/webservice/ and General Query Examples | CA Agile Central Help
Wendy is correct that you can use https://rally1.rallydev.com/slm/doc/webserviceto access the WSAPI API. You will need to be login to use this. It will give you a list of attributes that can be used on left hand side.
This link will also provide you with further information.
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Please let us know if you have any questions.