1

我有以下 SQL：

;WITH CTE 
     AS (SELECT AL.*, 
                RV.FORENAME, 
                RV.SURNAME, 
                RV.USERNAME                  AS RegistrantUsername, 
                E.FORENAME                   AS EmployeeForename, 
                E.SURNAME                    AS EmployeeSurname, 
                U.USERNAME, 
                CASE 
                  WHEN @Language = 2 THEN C.NAMELANG2 
                  ELSE C.NAMELANG1 
                END                          AS CompanyName, 
                CASE 
                  WHEN VC.COMPANYID IS NULL THEN 
                    CASE 
                      WHEN @Language = 2 THEN V.COMPANYNAMELANG2 
                      ELSE V.COMPANYNAMELANG1 
                    END 
                  ELSE 
                    CASE 
                      WHEN @Language = 2 THEN VC.NAMELANG2 
                      ELSE VC.NAMELANG1 
                    END 
                END                          AS VacancyCompanyName, 
                CASE 
                  WHEN @Language = 2 THEN V.JOBTITLELANG2 
                  ELSE V.JOBTITLELANG1 
                END                          AS JobTitle, 
                ROW_NUMBER() 
                  OVER( 
                    PARTITION BY AL.REGISTRANTID, AL.COMPANYID 
                    ORDER BY ACTIONDATE ASC) AS RN 
         FROM   DBO.HR_ACTIONLOG AL 
                LEFT OUTER JOIN DBO.REGISTRANTSLISTVIEW RV 
                             ON AL.REGISTRANTID = RV.REGISTRANTID 
                LEFT OUTER JOIN DBO.HR_EMPLOYEES E 
                             ON AL.EMPLOYEEID = E.EMPLOYEEID 
                LEFT OUTER JOIN DBO.HR_USERS U 
                             ON AL.USERID = U.USERID 
                LEFT OUTER JOIN DBO.HR_COMPANIES C 
                             ON AL.COMPANYID = C.COMPANYID 
                LEFT OUTER JOIN DBO.HR_VACANCIES V 
                             ON AL.VACANCYID = V.VACANCYID 
                LEFT OUTER JOIN DBO.HR_COMPANIES VC 
                             ON V.COMPANYID = VC.COMPANYID 
         WHERE  ( @Action IS NULL 
                   OR AL.ACTION = @Action ) 
                AND ( @DateFrom IS NULL 
                       OR DBO.DATEONLY(AL.ACTIONDATE) >= 
                    DBO.DATEONLY(@DateFrom) ) 
                AND ( @DateTo IS NULL 
                       OR DBO.DATEONLY(AL.ACTIONDATE) <= DBO.DATEONLY(@DateTo) ) 
                AND ( @CompanyID IS NULL 
                       OR AL.COMPANYID = @CompanyID ) 
                AND ( @RegistrantID IS NULL 
                       OR AL.REGISTRANTID = @RegistrantID ) 
                AND ( @VacancyID IS NULL 
                       OR AL.VACANCYID = @VacancyID ) 
        --ORDER BY AL.ActionDate DESC 
        ) 
SELECT * 
FROM   CTE 
WHERE  RN = 1;

它根据 actiondate 从组中返回第一个元素，这很好，但返回的结果未按日期排序意味着返回每个组的第一条记录，但此第一条记录的集合未按操作日期排序。我在 CTE 中尝试了 ORDER BY AL.ActionDate DESC 但它给出了错误：

The ORDER BY clause is invalid in views, inline functions, derived tables, subqueries, and common table expressions, unless TOP or FOR XML is also specified.
4

5 回答 5

2

在 cte 之外移动order by子句：

WITH CTE AS 
(
    ...
)
SELECT *
FROM CTE
WHERE RN = 1;
ORDER BY ActionDate DESC
于 2013-08-20T06:23:33.163 回答
2

你在外面点菜CTE

WITH CTE
AS
{
 ....
}
SELECT *
FROM CTE
WHERE RN = 1
ORDER BY ActionDate DESC
于 2013-08-20T06:23:39.577 回答
2

试试这个——

;WITH CTE AS
(
    SELECT  ...
    FROM dbo.hr_ActionLog AL
    LEFT JOIN ...
    WHERE AL.[Action] = ISNULL(@Action, AL.[Action])
        AND dbo.DateOnly(AL.ActionDate) BETWEEN 
            dbo.DateOnly(ISNULL(@DateFrom, AL.ActionDate))
            AND
            dbo.DateOnly(ISNULL(@DateTo, '30000101'))
        AND AL.CompanyID = ISNULL(@CompanyID, AL.CompanyID)
        AND AL.RegistrantID = ISNULL(@RegistrantID, AL.RegistrantID)
        AND AL.VacancyID = ISNULL(@VacancyID, AL.VacancyID)
)
SELECT *
FROM CTE
WHERE RN = 1
ORDER BY AL.ActionDate DESC;
于 2013-08-20T06:24:30.587 回答
2

是的，唯一ORDER BY影响返回结果的顺序是放在最外面的一个SELECT：

SELECT *
FROM CTE
WHERE RN = 1
ORDER BY ActionDate DESC
于 2013-08-20T06:24:33.720 回答
0

您ROW_NUMBER在 CTE 中有一个函数，并且查询仅使用RN=1.
如果我正确理解了问题，只需更改函数ORDER BY中的子句，ROW_NUMBER您应该会得到您正在寻找的结果。

于 2013-08-20T06:25:53.620 回答