Name Longititue latutute Time
tharindu 79.94148 6.9748404 00:15:47
shane 79.8630765 6.8910388 13:23:24
shane 79.862815 6.8909349 14:41:29
shane 79.8628665 6.8911084 09:39:33
shane 79.8626956 6.890992 11:00:07
shane 79.8628831 6.89099 11:43:00
i want get the result set as below
shane 79.862815 6.8909349 14:41:29
tharindu 79.94148 6.9748404 00:15:47
how can i write the sql query to get the result set, get the result set from the max time
You can try to use ROW_NUMBER window function.
SELECT Name,Longititue,latutute,[Time]
FROM (
SELECT *,ROW_NUMBER() OVER(PARTITION BY Name ORDER BY [Time] DESC) rn
FROM T
)t1
WHERE rn = 1
you can also try using correlated subquery
select * from tablename a
where Time in (select max(Time) from tablename b where a.name=b.name)
you can use corelated subquery
select t.* from table_name t
where t.[Time]=( select max([Time]) from table_name t1 where t1.Name=t.Name)
Here is a way to use ROW_NUMBER without a formal subquery:
SELECT TOP 1 WITH TIES
Name,
Longititue,
latutute,
Time
FROM yourTable
ORDER BY
ROW_NUMBER() OVER (PARTITION BY Name ORDER BY [Time] DESC);
Demo
You can achive this use CTE(Common Table Expression) and Ranking Function.
SQL Query:
WITH CTE AS
(
SELECT Name,Longititue,latutute,Time,DENSE_RANK() OVER(PARTITION BY Name ORDER BY time desc) as RN
FROM MaxTime
)
SELECT * FROM CTE
WHERE RN = 1
Related
How can I get the Latest amount, I already had some queries but instead it shows two records ,Im expecting to show only the the '7370' current amount
you can use correlated subquery
select * from tablename a where lasttime in (select max(lasttime) from tablename b where a.id=b.id)
OR you can use row_number()
select * from
(
select *,row_number() over(partition by id order by lasttime desc) as rn from tablename
)A where rn=1
Just add Top 1 before your fields.
Select TOP 1 fields from table
SELECT TOP 1 currentBalance FROM DBO.tbl_billing ORDER BY [date]
So I have a table that looks something like this:
Now, I want the max totalcst for both days, something like this:
I tried using different variations of max and the Row_number funtion but still can't seem to get the result I want. My query:
select date,pid,max(quan*cst), totalcst
from dbo.test1
group by date, pid
But this returns all the records. So if somebody can point me towards the right direction, that would be very helpful.
Thanks in advance!
ROW_NUMBER should work just fine:
WITH CTE AS
(
SELECT *,
RN = ROW_NUMBER() OVER(PARTITION BY [date] ORDER BY totalcst)
FROM dbo.YourTable
)
SELECT [date],
pid,
totalcst
FROM CTE
WHERE RN = 1
;
Here is one simple way:
select t.*
from test1 t
where t.totalcst = (select max(t2.totalcst) from test1 t2 where t2.date = t.date);
This often has the best performance if you have an index on (date, totalcst). Of course, row_number()/rank() is also a very acceptable solution:
select t.*
from (select t.*, row_number() over (partition by date order by totalcst desc) as seqnum
from test1
) t
where seqnum = 1;
I have thousands of groups in a table, something like :
1..
1..
2..
2..
2..
2..
3..
3..
.
.
.
10000..
10000..
How can i make a select that give me the Top 3 groups each time.
I Want something like select Top 3 from rows , but it have to return the first three groups not the first three rows.
You can try this :
;with cte as (
select distinct groupId from mytable order by groupid
)
select * from mytable where TheGroupId in (select top 3 groupdid from cte)
You can use DENSE_RANK to assign a number to each group. All members of the same group will have the same number. Then in an outer query, select top 3 groups:
SELECT *
FROM (SELECT *, DENSE_RANK() OVER (ORDER BY id) AS rnk
FROM mytable ) t
WHERE t.rnk <= 3
The above query assumes that id is the column used to group records together.
SQL Fiddle Demo
Use Ranking function Row_Number() :
SELECT *
FROM (SELECT *,
Row_number()
OVER(
partition BY GroupId
ORDER BY GroupId) AS [rn]
FROM YourTable) t
WHERE rn <= 3
Check this MSDN doc for details of all ranking functions.
There is a sql TOP statement that does this
SELECT TOP number|percent column_name(s) FROM table_name;
a description of what it does and how it is used in alternative sql statements for example for mysql and ms access can be found here: http://www.w3schools.com/sql/sql_top.asp
My bad i misread your question, this will return the top rows not groups, could you explain what you are trying to do in more detail?
SELECT *
FROM
(SELECT *
,ROW_NUMBER() OVER (PARTITION BY [Group] ORDER BY [Group] ASC)rn
FROM TableName
)A
WHERE rn <= 3
I have a table, myTable that has two fields in it ID and patientID. The same patientID can be in the table more than once with a different ID. How can I make sure that I get only ONE instance of every patientID.?
EDIT: I know this isn't perfect design, but I need to get some info out of the database and today and then fix it later.
You could use a CTE with ROW_NUMBER function:
WITH CTE AS(
SELECT myTable.*
, RN = ROW_NUMBER()OVER(PARTITION BY patientID ORDER BY ID)
FROM myTable
)
SELECT * FROM CTE
WHERE RN = 1
It sounds like you're looking for DISTINCT:
SELECT DISTINCT patientID FROM myTable
you can get the same "effect" with GROUP BY:
SELECT patientID FROM myTable GROUP BY patientID
The simple way would be to add LIMIT 1 to the end of your query. This will ensure only a single row is returned in the result set.
WITH CTE AS
(
SELECT tableName.*,ROW_NUMBER() OVER(PARTITION BY patientID ORDER BY patientID) As 'Position' FROM tableName
)
SELECT * FROM CTE
WHERE
Position = 1
I have a SQL query that does some ranking, like this:
SELECT RANK() OVER(PARTITION BY XXX ORDER BY yyy,zzz,oooo) as ranking, *
FROM SomeTable
WHERE ranking = 1 --> this is not possible
I want to use that ranking in a WHERE condition at the end.
Now I nest this query in another query and do filtering on the ranking there, but is there no easier or faster way to filter on such values from the SELECT statement?
Use a CTE (Common Table Expression) - sort of an "inline" view just for the next statement:
;WITH MyCTE AS
(
SELECT
RANK() OVER(PARTITION BY XXX ORDER BY yyy,zzz,oooo) as ranking,
*
FROM SomeTable
)
SELECT *
FROM MyCTE
WHERE ranking = 1 --> this is now possible!
Sorry for the former posting, i forgot : windowing functions can only be used in select or order by clauses.
You'll have to use a sub query:
SELECT * FROM
(
SELECT RANK() OVER(PARTITION BY XXX ORDER BY yyy,zzz,oooo) as ranking, *
FROM SomeTable
) t
WHERE ranking = 1
OR A CTE.
select * from (
select RANK() OVER(PARTITION BY name ORDER BY id) as ranking, *
from PostTypes
) A
where A.ranking = 1
https://data.stackexchange.com/stackoverflow/query/edit/59515