It's an SQL thing. Note that for unordered queries, talking about the 20th to the 50th row doesn't make any sense. There's no order, so there's no 20th or 50th. There are some databases out there that allow you to specify "20th to 50th row", but that's not portable, and you can't be sure you get the same results when doing the same query again (if the database would garantee the same results, it would have an implicite order, which would prevent the database from doing all kinds of optimizations).

The standard way is to use an index, sort the query using the index, and using an appropriate where clause to select the 20th to 50th row. This will give you a repeatable query.

Abigail

In reply to Re: mySQL query by Abigail-II
in thread mySQL query by Massyn

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.