Filter query result by most recent date

Question

This code:

SELECT  
    O896IA_VEMPPRSA.REG_NR & O896IA_VEMPPRSA.DIS_NR AS RRDD,  
    Mgmt_Lvl.MGMT_LVL,  
    Count(O896IA_VEMPPRSA.SYS_EMP_ID_NR) AS Total         


        

Answer 1

Say you have a table named [Survey] with the following data

RespondentID    SurveyDate  Answer1                         Answer2
------------    ----------  ----------------------------    ----------------------------
1               2013-01-01  answer 1, respondent 1, 2013    answer 2, respondent 1, 2013
1               2012-01-01  answer 1, respondent 1, 2012    answer 2, respondent 1, 2012
2               2012-01-01  answer 1, respondent 2, 2012    answer 2, respondent 2, 2012

You can use a query of the form...

SELECT Survey.*
FROM
    Survey
    INNER JOIN
    (
        SELECT RespondentID, MAX(SurveyDate) AS MaxOfSurveyDate
        FROM Survey
        GROUP BY RespondentID
    ) AS MaxDate
        ON Survey.RespondentID = MaxDate.RespondentID
            AND Survey.SurveyDate = MaxDate.MaxOfSurveyDate

...to return the most recent row for each respondent, which in this case would be:

RespondentID    SurveyDate  Answer1                         Answer2
------------    ----------  ----------------------------    ----------------------------
1               2013-01-01  answer 1, respondent 1, 2013    answer 2, respondent 1, 2013
2               2012-01-01  answer 1, respondent 2, 2012    answer 2, respondent 2, 2012