Thanks BBFU!
I implemented your code and it gives the most recent records for Larry and Robb, but I'm afraid I haven't been clear enough. I need to find within each set of records that share a common invoice number,
1) the most recent record (by timestamp) where the AGENT is either Robb or Larry; AND
2) the record (with the same invoice number) that immediately preceded it in the invoice chronology does NOT have Robb or Larry as the AGENT.
The data will support these conditions.
I hope that is clearer.
MrI

In reply to Re: Re: Searching a multidimensional list by Mister_Inkster
in thread Searching a multidimensional list by Mister_Inkster

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.