If the URL contains @var literals, YQL replaces the literals with the values of query parameters with the same names. For example, suppose that the URL for the call to the YQL Web Service has the animal query parameter:

http://query.yahooapis.com/v1/yql?animal=dog&q=select * from sometable where animal=@animal

For this URL, YQL will run the following SELECT statement:

select * from sometable where animal="dog"