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$sSQL = qq{ ... WHERE SAPP = ? AND SOWNERID = ? ... };
...
$sCursor->execute($gsApp, $sOwnerID);

$sSQL = qq{ ... WHERE (SAPP = ? OR (? is NULL AND SAPP is NULL)) AND .
+.. };
...
$sCursor->execute($gsApp, $gsApp, $sOwnerID, $sOwnerID);