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How to get several rows in a table into one row in my result set?

Posted on 2008-06-10
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Last Modified: 2011-10-19
Hi,

I have a table with several rows. One of the columns is an "id" column (in the attached picture this is the ConfigurationId column). Those rows (it can be 1 row or it could be 3, or x number of rows) who have the same value in the ConfigurationId column I want to be on one row in my query result.

How can I accomplish this?
database-snapshot-sql-main-repor.bmp
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Question by:kimfink
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11 Comments
 
LVL 75

Expert Comment

by:Aneesh Retnakaran
ID: 21749438
Hello kimfink,

SELECT a.* FROM urTable a
WHERE A.TestDateTime = (SELECT MAX(TestDateTime) from urTable WHERE ConfigurationID = a.ConfigurationID )


GOD Bless,
Aneesh R.
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 21749441
if you only want the select ConfigurationID column, it's easy (see below).

now, what about the other columns?
select ConfigurationID
   from yourtable
group by ConfigurationID

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Author Comment

by:kimfink
ID: 21749491
Hi again, let me precise my question.

Those rows who have the same value in the ConfigurationId column, I want to be joined into on one row and exactly one row in my query result.
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 21749506
yes, but which of the rows?
see, for each of the other columns, have different values.
so, what is the criteria for those values.
aneeshattingal posted the query to get the "latest" record based on the datetime column.
however, that might not be what you are looking for.

if you don't "see" what we are asking for, post the requested output.
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LVL 5

Expert Comment

by:ursangel
ID: 21749520
hi,
       I agree with Angelll's reply. If it is just the ConfigurationID column you want to select, them grouping by that coulmn will give you the result.
But if you want the other coulmn like TYPE along with the select, then it will defnitely give you 2 rows.
For eg:- TYPE has 2 values for the CONFIGURATIONID = 1.
TYPE  = ESD and PSD.

So in this case, you will have to go for looping and get the result set in a comma seperated value or something like that.

Please do let us know ur requirement
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Author Comment

by:kimfink
ID: 21749536
I want all the different rows with the same ConfigurationId, "joined" into exactly one row with all columns for the different rows with the same ConfigurationId.

As you can see in the attachment, but here I have used a regular join, so I also got rows that I don't want.
database-snapshot-sql-main-repor.bmp
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 21749563
kimfink:
let me repeat: in the 2 rows, you have 1 row with TYPE  = ESD and 1 row with TYPE = PSD.
so, what do you want to have in the column TYPE in the resulting row?
* ESD
* PSD
* ESD, PSD
in case you don't want to have both values, what will be the rule to choose ESD over PSD (or vice-versa)?
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Author Comment

by:kimfink
ID: 21749603
In my result set I would like a colum for both ESD and PSD, and if I could alias the columnames in the query, that would be great. This alos yields for the other columns in the two rows. I don't want the values in a comma seperated list in one colum.

E.g. what i want is to join these two rows (as you could see in my last attachment), but when I join these two rows, I get 4 rows, and it is only one of these rows that I am intrested in, and that I want in my result set. This may not be possible...
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 21749662
please!
post the FINAL requested output, in data (not in words).
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Author Comment

by:kimfink
ID: 21749688
See my last attachement in my previous post. Row 2 is what i want!!!
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LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 21749745
... ok...
can you show us the query you used to produce that result?


anyhow, it might be like this (for the data)
if that is ok for the output, replace the ESD.* and PSD.* by the column names with the alias names you want, eg.

SELECT ESD.ConfigurationID
, ESD.Type ESD, ESD.TestTemperature ESD_TestTemperature
, PSD.Type PSD, PSD.TestTemperature PSD_TestTemperature
...
 from yourtable ESD
  join yourtable PSD
    ON ESD.configurationID = PSD.ConfigurationID
   AND PSD.Type = 'PSD'
  WHERE ESD.Type = 'ESD'

select ESD.*, PSD.*
  from yourtable ESD
  join yourtable PSD
    ON ESD.configurationID = PSD.ConfigurationID
   AND PSD.Type = 'PSD'
  WHERE ESD.Type = 'ESD' 

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