How can I select data with the largest version number?
Hi I have this code here but something is wrong:
select a.Title
from t_ABC a
where a.version = Max(a.version);
The table contains multiple entries with the same title, having a different version number. Is it possible to select the ones with the greatest version for each Title?
Thanks.
select a.Title
from t_ABC a
where a.version = Max(a.version);
The table contains multiple entries with the same title, having a different version number. Is it possible to select the ones with the greatest version for each Title?
Thanks.
select title from (
select title from t_abc
order by version desc
)
where rownum = 1
select title from t_abc
order by version desc
)
where rownum = 1
ooops, ignore my previous post, that was to get the title for highest overall version
not version per title.
select * from
(
select t_abc.*, row_number() over(partition by title order by version desc) rn from t_abc
)
where rn = 1
not version per title.
select * from
(
select t_abc.*, row_number() over(partition by title order by version desc) rn from t_abc
)
where rn = 1
ASKER
The problem is that I am using a nested query and cannot have two columns. Is there any other way please?
thanks.
thanks.
SELECT Title
FROM
(select a.Title, MAX(a.version)
from t_ABC a
group by a.Title
)b
FROM
(select a.Title, MAX(a.version)
from t_ABC a
group by a.Title
)b
If you want just the version number...
SELECT Version
FROM
(select a.Title, MAX(a.version) AS Version
from t_ABC a
group by a.Title
)b
SELECT Version
FROM
(select a.Title, MAX(a.version) AS Version
from t_ABC a
group by a.Title
)b
ASKER CERTIFIED SOLUTION
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"The problem is that I am using a nested query and cannot have two columns. Is there any other way please?"
You can't do it with a nested query. You have to use a derived table.
ex:
select a.Title
from t_ABC a
join (select title,max(version) maxVersion from t_ABC group by Title)b
on a.title=b.title
and a.version = b.maxversion
You can't do it with a nested query. You have to use a derived table.
ex:
select a.Title
from t_ABC a
join (select title,max(version) maxVersion from t_ABC group by Title)b
on a.title=b.title
and a.version = b.maxversion
If you only want the title and no other columns, then who cares about the version...
select distinct title from t_abc
select distinct title from t_abc
Maybe it would be better to provide us with the fully query so we know the context of how it's being used.
Also, is this for SQL Server or Oracle? What version?
Also, is this for SQL Server or Oracle? What version?
That way, you can have other columns in the select portion as well. Since this is a version, I would suspect only one row can have a version, so either method should work.
Oracle 8.x in zones it looks like, but yes please confirm.
aaronakin, I believe it's Oracle and version 8, based on the zones the query was posted to.
Rassac, if none of the above options work please post some sample data and expected output
there are multiple ways to interpret what it is you are requesting.
Rassac, if none of the above options work please post some sample data and expected output
there are multiple ways to interpret what it is you are requesting.
Rassac, for my second example (http:#22634241), I was trying to suggest same as Brandon in comment following mine. I left out the Group By Title, so if you liked second method better look at Brandon's comment - http:#22634249.
can version be NULL?
if not, then the query in 22634249 is just a complicated (slower) way to write
select distinct title from t_abc
if version can be NULL, then how do you want those nulls processed?
if not, then the query in 22634249 is just a complicated (slower) way to write
select distinct title from t_abc
if version can be NULL, then how do you want those nulls processed?
from t_ABC a
group by a.Title