AND CAST(CONVERT(nvarchar(20), AUDIT_DATE + ' ' +AUDIT_TIME ,101) AS DATETIME) BETWEEN 'Jan 1 2000 12:00AM' AND 'Jul 7 2010 12:00AM' ORDER BY CAST((AUDIT_DATE ) AS DATETIME), CAST((AUDIT_TIME ) AS DATETIME), AUDIT_ID
- чистое зло - и сделает любой индекс на AUDIT_DATE / AUDIT_TIME бесполезным.