Hi all, I'm new to this mailing list. I did web development in python with Django framework before. But I really like the haskell language, so considering building my next site (a LBS-SN like service) in haskell. I learn snap for a while and think it's not so mature and powerful. After I learned the yesod docs in one day and read some yesod and haskellers.com codes in the following few days, I appreciate it and try to use it seriously. Now I need a database query across two table, so as to sql join feature. Currently, persistent doesn't provide this functionality. I think maybe adding a function to PersistBackend class, and implementing it in PersistBackend (SqlPersist m) may solve the problem. However, I am not sured. Will it be difficult and consistent to implement this feature? Thanks for any help. Sincerely, -- James Deng department of computer science, school of information science & technology, Sun-yat-sen University, Guangzhou, China mailTo: cnJamesDeng@gmail.com homepage: http://cnjdeng.appspot.com