獲取最新的日期行值

select s.s_nric as NRIC 
     , s.s_name as NAME 
     , status.st_status 
     , DATE_FORMAT(status.st_fromdate,'%d-%m-%Y') as from_date 
     , DATE_FORMAT(status.ST_ON,'%d-%m-%Y') as ST_ON 

FROM si_student_data AS s 
    LEFT JOIN si_student_status As st 
    ON st.st_nric=s.s_nric 
    INNER JOIN 
    (SELECT t.st_nric 
      , t.st_fromdate 
      , t.st_status 
      , MAX(t.st_todate) as ST_ON 
     FROM si_student_status t 
     GROUP BY t.st_nric 
    ) AS status 
    ON ( s.s_nric=status.st_nric 
     AND status.ST_ON=st.st_todate) 
    LEFT JOIN si_student_changes as s1 
    ON s1.ch_nric = s.s_nric 

    where 1=1 
    AND s1.ch_class='2S1' 
    AND s1.ch_year='2011' 

    GROUP BY s.s_nric 

    ORDER BY s1.ch_class 
      , s.s_gender 
      , s.s_name asc

當我使用這個查詢時，我可以得到最大日期值與各自的數字。但我無法得到與日期相關的其他值。它只能獲得具有不同行值的最大日期。我想相關的值（狀態）的日期我的示例表：第一個表：si_student_data獲取最新的日期行值

s_nric   s_name 
1    Suba 
2    Felix 
3    welcome

二田部：si_student_changes

ch_nric   ch_year   ch_class 
1     2011    2S1 
2     2011    2S1 
3     2011    2S1 
4     2010    1A1 
5     2011    2T3 
1     2010    1A1

三表：si_student_status

st_nric    st_status   st_fromdate    st_todate 
    1      Active    10-10-2011   10-11-2011 
    1      Inactive   11-11-2011   12-12-2011 
    1      PRO     13-12-2011   22-12-2011 
    2      LWR     10-10-2011   10-11-2011 
    2      Inactive    11-11-2011   12-12-2011 
    2      ATTR     13-12-2011   20-12-2011 
3      Active    04-01-2011  10-05-2011

3 Inactive 11-05-2011 12-08-2011 3 PRO 13-08-2011 20-10-2011

我期待輸出

s_nric  s_name  st_status st_fromdate   st_todate 
1   Suba  PRO  13-12-2011   22-12-2011 
2   Felix  ATTR  13-12-2011   20-12-2011 
3   welcome PRO  13-08-2011   20-10-2011

請解釋如何能得到最大的日期值記錄。我想要最大日期和相同的行值。

來源

2011-06-14 Suba

請格式化你的SQL所以每個人都可以輕鬆地閱讀它 – Ibu 2011-06-14 08:04:49

只需添加表st所需的字段。不要在SELECT列表中使用status.*：

select s.s_nric as NRIC 
    , s.s_name as NAME 

    , st.st_status 
    , DATE_FORMAT(st.st_fromdate,'%d-%m-%Y') as from_date 
    , DATE_FORMAT(st.st_todate,'%d-%m-%Y') as ST_ON

所以，整個查詢可以寫成：

SELECT s.s_nric AS NRIC 
     , s.s_name AS NAME 
     , st.st_status 
     , DATE_FORMAT(st.st_fromdate,'%d-%m-%Y') AS from_date 
     , DATE_FORMAT(st.st_todate,'%d-%m-%Y') AS ST_ON 

FROM si_student_data AS s 
    LEFT JOIN si_student_status AS st 
    ON st.st_nric = s.s_nric 
    INNER JOIN 
    (SELECT t.st_nric 
      , MAX(t.st_todate) AS ST_ON 
     FROM si_student_status t 
     GROUP BY t.st_nric 
    ) AS status 
    ON ( s.s_nric = status.st_nric 
     AND status.ST_ON = st.st_todate) 
    LEFT JOIN si_student_changes as s1 
    ON s1.ch_nric = s.s_nric 

    WHERE 1=1 
    AND s1.ch_class='2S1' 
    AND s1.ch_year='2011' 

    GROUP BY s.s_nric 

    ORDER BY s1.ch_class 
      , s.s_gender 
      , s.s_name asc

來源

2011-06-14 08:13:31

SELECT s.*,p.name, FROM `status` as s 
left join profile as p (s.id = p.id) 
WHERE s.date= (select MAX(s.date) from status)

來源

2011-06-14 08:19:42 K6t

獲取最新的日期行值

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