从MySQL获取每个人的最新记录

Question

我有一张这样的桌子

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? PK ?  NAME  ?   DEGREE    ? YEAR_OF_PASSING ?
???????????????????????????????????????????????
?  1 ? Shrey  ? B.E.        ?            2004 ?
?  2 ? Shrey  ? High School ?            2000 ?
?  3 ? Gaurav ? B.E.        ?            2000 ?
?  4 ? Gaurav ? M.Sc.       ?            2002 ?
???????????????????????????????????????????????

如何查询获取每个人最新学位的结果集,如下所示？

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? PK ?  NAME  ? DEGREE ? YEAR_OF_PASSING ?
??????????????????????????????????????????
?  1 ? Shrey  ? B.E.   ?            2004 ?
?  4 ? Gaurav ? M.Sc.  ?            2002 ?
??????????????????????????????????????????

Answer 1

SELECT  a.*
FROM    tableName a
        INNER JOIN
        (
            SELECT  Name, MAX(Year_Of_Passing) max_val
            FROM tableName
            GROUP BY Name
        ) b ON  a.name = b.name AND
                a.Year_Of_Passing = b.max_val

• SQLFiddle演示

更新1

SELECT  a.*
FROM    tableName a
        INNER JOIN
        (
            SELECT  Name, MAX(Year_Of_Passing) max_val, MAX(PK) max_pk
            FROM tableName
            GROUP BY Name
        ) b ON  a.name = b.name AND
                CASE WHEN b.max_val IS NULL
                     THEN a.pk = max_PK
                     ELSE a.Year_Of_Passing = b.max_val 
                  END

• SQLFiddle演示