I think if you would provide an example of how you have tried it so far, it would be easier to help you. Right now I don't even know which YQL table you are trying to use.

okie.. select * from yahoo.finance.quote where symbol in ("YHOO") this gives us the quotes and details of yahoo. what i am looking for is i need to retrieve all the companies and there symbols of a particular stoke market ex:all companies of Bombay Stock Exchange Then retrieve the quotes for those companies.