Well it depends on what you are trying to do. If the result of the joined query is much smaller than the underlying tables, it may make sense to do the join in the server to reduce reload time and bandwidth.
However, if this join is complex or coming from large underlying tables, then this might place an unacceptable burden on the server, and if it is a busy transaction processing server, you may want to prioritize the server availability over reload performance.
Logic will get you from a to b. Imagination will take you everywhere. - A Einstein
