[Typo3-dev] Nested Queries in MySQL wrapper class

[Joel Faucett]

Hello all-
    How does one implement nested queries in the wrapper functions? e.g. 
I want to get the 5 most recent items sorted by title, but the following 
code returns an empty result.  Is it an SQL error that I'm not seeing or 
have I structured it incorrectly?

$innerQuery = 'SELECT uid FROM tx_tekresearch_sum ORDER BY crdate DESC 
LIMIT 5';
$res = $GLOBALS['TYPO3_DB']->exec_SELECTquery(
    '*',         // SELECT ...
    'tx_tekresearch_sum',     // FROM ...
    'uid IN ('.$innerQuery.')',    // WHERE...
    '',            // GROUP BY...
    'title',    // ORDER BY...
    ''            // LIMIT ...
    );

On a side note, this is my first project with Typo3 and I look forward 
to developing more as I get more proficient.

Thanks in advance,
Joel Faucett