To reduce the number of queries you send to the database, along with the associated round-trip delay, you could 'SELECT County FROM Counties WHERE ' . join(' OR ', map "ID = $_", @current_member_ids) . ' order by ID' and then loop over the results building the associations for each member record.

(Also note that Access may also support an alternative to that OR list using a syntax like "ID is in (7, 12, 42)"; and as a general rule, you should consider using placeholders instead of embedded values in literal queries as shown above.)

It's true that you can't do it all in one query, for the reasons mentioned in other replies, but doing it in a constant two queries and a foreach loop is definitely better than doing hundreds of separate queries, one for each match.

In reply to Re: Slightly OT - SQL Question by simonm
in thread Slightly OT - SQL Question by digger

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.