[erlang-questions] Selecting X number of items from Mnesia

Ulf Wiger <>
Fri Feb 8 09:06:18 CET 2008


I'd have to check on how to do it with QLC, but using
mnesia:select(Tab, MatchSpec, NObjs, Lock), you
can quite easily pull the N first objects from an
ordered_set table.

BR,
Ulf W

2008/2/8, Dave Bryson <>:
> I apologize in advance for the newbie question!
>
> I'm trying to treat an mnesia table as a FIFO queue. What I'd like to
> be able to do is pull X number of items off the head of the list
> returned by a query. There's no conditional values to isolate the
> records - I just want the top X number of records.  Is there an
> efficient way to do this with qlc?
>
> Thanks in advance!
>
> Dave
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