Hi, I have set up a connection to the database using postgreSQL but I have a few questions while running the following queries: <div> </div> <div>> (send a-connection map a-statement proc)   map : Statement (field ... -> 'a) -> (list-of 'a)   Executes a SQL query and applies the given function to the contents   of each row, returning a list of results. > (send a-connection for-each a-statement proc)   for-each : Statement (field ... -> void) -> void   Executes a SQL query and applies the given function to the contents   of each row, discarding the results. > (send a-connection mapfilter a-statement map-proc filter-proc)   mapfilter : Statement (field ... -> 'a) (field ... -> boolean) -> (list-of 'a)   Like 'map', but applies the map procedure (given first) to only   those rows which satisfy the given predicate (given second). > (send a-connection fold a-statement proc init)   fold : Statement ('a field ... -> 'a) 'a -> 'a What should be the structure of the proc...? Can you send me one entire example which explains the use of "proc" as well as "map-proc" and "filter-proc" and their structure or the body of these functions....?</div> <div> </div> <div>Any help would be much appreciated.</div> -- Rohan.B.Golwala