Fetch Max from a date column grouped by a particular field

Posted by vamyip on Stack Overflow See other posts from Stack Overflow or by vamyip
Published on 2011-01-17T13:51:05Z Indexed on 2011/01/17 13:53 UTC
Read the original article Hit count: 211

Filed under:

sql

|

aggregate-functions

|

sql-join

Hi,

I have a table similar to this:

LogId  RefId   Entered
==================================
1      1       2010-12-01
2      1       2010-12-04
3      2       2010-12-01
4      2       2010-12-06
5      3       2010-12-01
6      1       2010-12-10
7      3       2010-12-05
8      4       2010-12-01

Here, LogId is unique; For each RefId, there are multiple entries with timestamp. What I want to extract is LogId for each latest RefId.

I tried solutions from this link:http://stackoverflow.com/questions/121387/sql-fetch-the-row-which-has-the-max-value-for-a-column. But, it returns multiple rows with same RefId.

Can someone help me with this?

Thanks

Vamyip

© Stack Overflow or respective owner

Related posts about sql

SQL SERVER – Concat Strings in SQL Server using T-SQL – SQL in Sixty Seconds #035 – Video

as seen on SQL Authority - Search for 'SQL Authority'
Concatenating string is one of the most common tasks in SQL Server and every developer has to come across it. We have to concat the string when we have to see the display full name of the person by first name and last name. In this video we will see various methods to concatenate the strings. SQL… >>> More
SQL SERVER – Concat Function in SQL Server – SQL Concatenation

as seen on SQL Authority - Search for 'SQL Authority'
Earlier this week, I was delivering Advanced BI training on the subject of “SQL Server 2008 R2″. I had great time delivering the session. During the session, we talked about SQL Server 2010 Denali. Suddenly one of the attendees suggested his displeasure for the product. He said, even though… >>> More
Error with SQL Server Setup 2012 on Windows 2012

as seen on Server Fault - Search for 'Server Fault'
I am trying to install SQL Server on Windows 2012. I was able to finally get the wizard up and running after making some changes on the server, but now it fails no matter what I do with the following error: TITLE: SQL Server Setup failure. SQL Server Setup has encountered the following error: … >>> More
How can I detect which version of SQL (eg SQL 2008 or SQL Azure)

as seen on Stack Overflow - Search for 'Stack Overflow'
I need to detect which version of SQL I am dealing with to perorm various tasks, I need specifically detect if I am on SQL 2008 or SQL Azure. How can I do this with detection code written in SQL? >>> More
Nested SQL Select statement fails on SQL Server 2000, ok on SQL Server 2005

as seen on Stack Overflow - Search for 'Stack Overflow'
Here is the query: INSERT INTO @TempTable SELECT UserID, Name, Address1 = (SELECT TOP 1 [Address] FROM (SELECT TOP 1 [Address] FROM [UserAddress] ua INNER JOIN UserAddressOrder uo ON ua.UserID = uo.UserID WHERE ua.UserID = u.UserID ORDER BY uo.AddressOrder ASC) q ORDER BY AddressOrder… >>> More

Related posts about aggregate-functions

Multiple aggregate functions in one SQL query from the same table using different conditions

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm working on creating a SQL query that will pull records from a table based on the value of two aggregate functions. These aggregate functions are pulling data from the same table, but with different filter conditions. The problem that I run into is that the results of the SUMs are much larger… >>> More
MYSQL : First and last record of a grouped record (aggregate functions)

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to do fectch the first and the last record of a 'grouped' record. More precisely, I am doing a query like this SELECT MIN(low_price), MAX(high_price), open, close FROM symbols WHERE date BETWEEN(.. ..) GROUP BY YEARWEEK(date) but I'd like to get the first and the last record of the… >>> More
Excel aggregate functions to summarise figures against grouped column

as seen on Super User - Search for 'Super User'
I have a spreadsheet much like the on on this page: Painless Software Schedules I wish to create a summary sheet with the Feature against the totals for that feature of "Orig Est", "Curr Est", "Elapsed" and "Remain". Is there an appropriate Excel feature to generate this summary? Preferably one… >>> More
Excel aggregate functions to summarise figures against distinct figures

as seen on Super User - Search for 'Super User'
I have a spreadsheet much like the on on this page: Painless Software Schedules I wish to create a summary sheet with the Feature against the totals for that feature of "Orig Est", "Curr Est", "Elapsed" and "Remain". Is there an appropriate Excel feature to generate this summary? Preferably one… >>> More
Django ORM: Ordering w/ aggregate functions — None special treatment

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm doing query like that: SomeObject.objects.annotate(something=Avg('something')).order_by(something).all() Now, I normally have an aggregate field in my model that I use with Django signals to keep in sync, however in this case perfomance isn't an issue so I thought I'd keep it simple and… >>> More