"If you use LIMIT row_count with ORDER BY, MySQL ends the sorting as soon as it has found the first row_count lines rather than sorting the whole table. "
http://dev.mysql.com/doc/mysql/en/limit-optimization.html
I need to get the top $num results from a completely sorted table (eg sorted on ID, ie the $num latest inserted rows). Which functions should I be considering?
LIMIT works that way, the write-up is just confusing. If you "ORDER BY id DESC LIMIT 10", then you'll get the 10 highest values of "id" in the result. The write-up just means that MySQL isn't going to bother sorting the rest of the table after it finds the 10 highest (or whatever your limit is). Is that what you're after?
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