如前所述，除非使用 TOP 或 FOR XML，否则 ORDER BY 不得出现在子查询中.

As stated ORDER BY must not apper in subqueries unless TOP or FOR XML is used.

    SELECT TOP 10 * FROM ( 
    SELECT 
        c.id, 
        c.name, 
        c.inserteddate, 
        c.cityname, 
        ftblstates.name AS statename, 
        clc.name AS catname, 
        '' AS listingimagelogo, 
        '' AS orgname, relocateyn, 
        '' AS employerclassified
    FROM tblclassifieds c 
    LEFT JOIN tblclassifiedscategories clc ON c.categoryid = clc.id
    LEFT JOIN ftblstates ON c.stateid = ftblstates.id 
    WHERE c.expirydate != ''
    AND NOT c.id IN ( 
        SELECT TOP 10 
            tblclassifieds.id 
        FROM tblclassifieds 
        WHERE c.expirydate != ''
        ORDER BY inserteddate desc 
    ) 
    UNION ALL
    SELECT 
        ce.id, 
        ce.name, 
        ce.inserteddate, 
        suburb AS cityname, 
        ftblstates.name AS statename, 
        ce.jobtype AS catname, 
        ce.listingimagelogo, 
        ce.orgname, '' AS relocateyn, 
        '1' AS employerclassified 
    FROM tblclassifiedemployers ce 
    LEFT JOIN ftblstates ON ce.stateid = ftblstates.id 
    WHERE ce.expirydate != ''
    AND NOT ce.id IN ( 
        SELECT TOP 10 
            tblclassifiedemployers.id 
        FROM tblclassifiedemployers 
        WHERE ce.expirydate != ''
        ORDER BY inserteddate desc
    )
) a ORDER BY inserteddate desc;