MS SQL Server select rows with max values - sql

Question

Good day
I have Table1:
COLUMN1 COLUMN2 Column3
----------------------------
Eva Apple 1
Eva Apple 2
Eva Apple 3
Eva Apple 4
Eva Apple 5
Eva Apple 6
Bob Apple 1
Bob Samsung 1
Bob Samsung 2
... ... ...
I need
COLUMN1 COLUMN2 Column3
----------------------------
Eva Apple 6
Bob Samsung 2
Bob Apple 1
... ... ...
How i can setup string for select only rows with MAX values in Column3 ?
My version of string is :
SELECT MAX(Column3) , [column2], [Column2]
FROM Table1
WHERE Column3 = MAX ;
Thanks for Opinions

Answer 1

You can use row_number
Select top (1) with ties *
from table1
order by row_number() over (partition by Column1, Column2 order by Column3 desc)
Other way is to use outer query:
Select * from (
Select *, RowN = row_number() over (partition by Column1, Column2 order by Column3 desc) from table1 ) a
Where a.RowN = 1

Answer 2

You want to find the maximum Column3 for each combination of Column1 and Column2.
You can achieve this with a GROUP BY
SELECT Column1, Column2, MAX(Column3)
FROM Table1
GROUP BY Column1, Column2
See https://learn.microsoft.com/en-us/sql/t-sql/queries/select-group-by-transact-sql

Answer 3

select * from (
SELECT *, rn=ROW_NUMBER() over (partition by COLUMN1,COLUMN2,Column3 order by
Column3 desc)
FROM Table1
)
WHERE rn=1

Answer 4

Please try the following:
WITH B AS
(
SELECT
Column1, Column2, Column3,
ROW_NUMBER() OVER (PARTITION BY Column1, Column2 ORDER BY Column3 DESC) AS row_num
FROM
Table1
)
SELECT Column1, Column2, Column3
FROM B
WHERE row_num = 1

Answer 5

You need to add a group by. In queries of this type, you have a set of columns you want the values from (these are the columns you group by) and you have other columns most of whose values you'll throw away. You use a function like MAX, MIN, SUM, AVG to specify what to do with the data from rows that are "thrown away". The result is a unique set of values from the columns that were grouped, and a single value corresponding to the min/max/avg etc from the columns that were not grouped:
SELECT [column1], [Column2], MAX(Column3) as Column3
FROM Table1
GROUP BY Column3 ;

Answer 6

Add a Group by on column 3.
Select col1, col2, max(col3)
from test
Group By col3

Answer 7

You can use a function like DENSE_RANK().
In this example, if there are duplicate values you want to retrieve.
declare #t as table (COLUMN1 char(3), COLUMN2 varchar(10), COLUMN3 int)
INSERT #t (COLUMN1 , COLUMN2 , COLUMN3 ) select 'Eva', 'Apple' ,1
INSERT #t (COLUMN1 , COLUMN2 , COLUMN3 ) select 'Eva', 'Apple' ,2
INSERT #t (COLUMN1 , COLUMN2 , COLUMN3 ) select 'Eva', 'Apple' ,3
INSERT #t (COLUMN1 , COLUMN2 , COLUMN3 ) select 'Bob', 'Apple' ,1
INSERT #t (COLUMN1 , COLUMN2 , COLUMN3 ) select 'Bob', 'Samsung' ,1
INSERT #t (COLUMN1 , COLUMN2 , COLUMN3 ) select 'Bob', 'Samsung' ,2
SELECT * FROM (
SELECT DENSE_RANK() OVER (PARTITION BY COLUMN1, COLUMN2 ORDER BY COLUMN1, COLUMN3 desc) [Max] , * from #t ) as T
WHERE max = 1 -- Set here what position do you want
Order by COLUMN3