SELECT a.*                  
  FROM (SELECT ROW_NUMBER() OVER(PARTITION BY A  ORDER  BY B DESC) rn,
               AAAAA.*
          FROM AAAAA) a where a.rn=1

SELECT a.*									
  FROM (SELECT ROW_NUMBER() OVER(PARTITION BY 要分組的欄位（站碼） BY 條件列（最高水位值） DESC) rn,
 

               表名.*
          FROM 表名) a where a.rn=1

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