SQL Server - Too many rows returned by join

I have the following tables (cut down examples)

Table1: [Detail_ID], [Information]
Table2: [ID], [Detail_ID], [Date], [MoreInformation]

What I'm trying to do is get the following query:

Table1.[Detail_ID], Table1.[Information], Table2.[Date], Table2.[MoreInformation]

The problem is that Table2 is linked on a one to many basis with Table1, so when I join it I get multiple rows.  Taking this as the source data:

Table1

1 : Info1
2 : Info2
3 : Info3

Table2

1 : 1 : 01/01/2000 : MoreInfo1
2 : 1 : 02/03/2001 : MoreInfo2
3 : 2 : 01/01/2000 : MoreInfo3
4 : 2 : 02/03/2001 : MoreInfo4
5 : 3 : 01/03/2002 : MoreInfo5

I would like to return the following (Getting only the most recent data for each ID in Table2:

1 : Info1 : 02/03/2001 : MoreInfo2
2 : Info2 : 02/03/2001 : MoreInfo4
3 : Info3 : 01/03/2002 : MoreInfo5

Unfortunately I can only get it to return all of the rows from Table2 at the moment.  Your assistance is appreciated.

Open in new window

LVL 2
PsychotextAsked:
Who is Participating?
 
Aneesh RetnakaranConnect With a Mentor Database AdministratorCommented:
Slight correction

SELECT Table1.[Detail_ID], Table1.[Information], Table2.[Date], Table2.[MoreInformation]
FROM Table1 INNER JOIN Table2
ON Table1.Detail_ID = Table2.Detail_Id
WHERE Table2.Date = (SELECT MAX(Date) from Table2 t2 where t2.Details_ID = table2.Details_ID )

0
 
Aneesh RetnakaranDatabase AdministratorCommented:
SELECT Table1.[Detail_ID], Table1.[Information], Table2.[Date], Table2.[MoreInformation]
FROM Table1 INNER JOIN Table2
ON Table1.Detail_ID = Table2.Detail_Id
WHERE Table2.Date = (SELECT MAX(Date) from Table2 t2 where t2.ID = table2.ID )
0
 
PsychotextAuthor Commented:
Unfortunately that didn't appear to work.  I'm still getting back all of the values.
0
Cloud Class® Course: Microsoft Office 2010

This course will introduce you to the interfaces and features of Microsoft Office 2010 Word, Excel, PowerPoint, Outlook, and Access. You will learn about the features that are shared between all products in the Office suite, as well as the new features that are product specific.

 
pssandhuCommented:
Is your ID column an identity column? In other words each time a new record is inserted does the value in the ID column added automatically?
0
 
Daniel WilsonCommented:
Can you provide the entire table structure?  The code above should work for your cut-down example.
0
 
pssandhuCommented:
Try this:

Select  t1.*, t2.Date, t2.MoreInformation
From    Table1 t1 INNER JOIN (Select   t.*
                                                From     Table2 t INNER JOIN (Select Detail_Id, Max(Date)  Date
                                                                                               From   Table2
                                                                                               Group by Detail_ID) d
                                                            ON t.Detail_id = d.Detail_id and t.Date = d.Date) t2
           ON t1.Detail_id = t2.Detail_id

Cheers!

P.
0
 
PsychotextAuthor Commented:
My apologies, the suggestion from aneeshattingal was not in error... I've just double checked it and there is however a slightly different issue involving duplicate dates in table 2.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.