Question

Column1 Column2 Column3
------- ------- -------
jim       1788    5F 
jim       2000    9F
jim       500     9F
ben       190     4H
matt      400     46
matt      20      3G

I need to run a query that outputs:

Column1 MaxValue PL
------- ------- -------
jim       2000    9F
jim       2000    NULL
ben       190     4H
matt      400     46
matt      400     NULL

For each value in Column1 (e.g. jim, ben, matt): we group the data by Column1 and for each group we display the row that has the maximum value on column2.
Then, for each row found in this manner, it displays it again but with NULL in column3, if the groupping by Column1 returns more than 1 row and there are smaller values in Column2 than the maximum found number in the previous step.
ben 190 NULL is not displayed because we have ben only once on Column1.

Thank you in advance for any tips or suggestions.

This is what I tried so far but I receive an error prompting me to include Column2 and Column3 in the GROUP By clause, but if I do so I don’t reach the desired output as shown above.

CREATE VIEW VIEWB AS 
   SELECT DISTINCT t1.Column1, 
          /* MAX_Value */
            (MAX(t1.[Column2])) AS [MAX Value], 
          /* PL */
            (CASE 
            WHEN t1.[Column2] = MAX(t1.[Column2]) THEN t1.[Column3]
            ELSE NULL
            END) AS PL
      FROM TABLEA AS t1
      GROUP BY t1.Column1;

Answer 1

try this

;with cte as (select *,ROW_NUMBER() over(partition by Column1 
order by Column2 desc) as row_num from table_A),
a as (
select Column1,MAX(Column2) [Column2],null [row_num]
from table_A
group by Column1
having COUNT(*)>1),
b as (select Column1,Column2,Column3 from cte where row_num=1
union all
select * from a)
select  Column1,Column2 [MaxValue],Column3 [PL] from b
order by Column2 desc,Column1,ISNULL(Column3,'') desc