如何在客户端浏览器中执行类似SQL的查询？

I've been looking for a way to do complex queries like SQL can perform but totally client side. I know that I can get the exact results that I want from doing SQL queries off of the server and I could even AJAX it so that it looks smooth. However for scaleability, performance, and bandwidth reasons I'd prefer to do this all client side.I've been looking for a way to do complex queri