DISTINCT values from a table

Hi,

I am trying to output a list of data from a table, showing only one record of each TypeID.

So, for instance, I have a simple SQL query that says:

SELECT DISTINCT AlbumTypeIDFROM AlbumORDER BY AlbumTypeIDDESC

This works correctly, and gives a list of 1,2,3. But I need more information than that, I want the Description field output with the ID, but how can I do this without assigning that to be Distinc also?

When I try: SELECT DISTINCT AlbumTypeID, Description FROM Album ORDER BY AlbumTypeID DESC

The output is completely wrong.

Many thanks

My guess is that Description doesn't belong to AlbumTypeID, but to something like AlbumID. If you have an AblumType table with an AlbumTypeID and a Description, change you query to run against that table instead:

SELECT DISTINCT AlbumTypeID, Description FROM AlbumType ORDER BY AlbumTypeID DESC

|||

SELECT DISTINCT AlbumTypeID, Description FROM Album ORDER BY AlbumTypeID DESC

Presumably you have lots of album types and lots of descriptions, so this query will only return results where the combination of the two fields is different to all the other results. For example, two AlbumTypeId of 1 records with a description of "Cars" would result in a single record.

What did you want to get back?

|||

Try

SELECT DISTINCT dbo.GetFirstAlbumDescription(AlbumTypeId), AlbumTypeId FROM Album
where
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE FUNCTION dbo.GetFirstAlbumDescription
(
@.AlbumTypeId INT
)
RETURNS VARCHAR(100)
AS
BEGIN
DECLARE @.RETURN VARCHAR(100)
SELECT @.RETURN = DESCRIPTION FROM Album WHERE Id = (SELECT Min(Id) FROM Album WHERE AlbumTypeId = @.AlbumTypeId)
RETURN @.RETURN
END
GO|||When I ran it I got
AlbumTypeId
-------- ----
Album 1 of 1 1
Album 1 of 2 2
Album 1 of 3 3

(3 row(s) affected) [excess apces deleted]|||

Hmmm

Basically, I have 2 tables,

One holds the Album information : AlbumID (PK), Album Description, Owner, DateOfCreation, AlbumTypeID (FK)

One holds the Album type information : AlbumTypeID (PK), TypeDescription

I want to show the last record entered into tblAlbum of each AlbumType.

So for my album table,

AlbumID Desc AlbumTypeID

1 First Record of Type 1 1

2 Second Record of Type 1 1

3 First Record of Type 2 2

So from the SP, possibly using a DISTINCT on the AlbumTypeID, I'd hope the output to be something like:

AlbumID Desc AlbumTypeID

2 Second Record of Type 1 1

3 First Record of Type 2 2

Any clues?

|||

Hmmm

Basically, I have 2 tables,

One holds the Album information : AlbumID (PK), Album Description, Owner, DateOfCreation, AlbumTypeID (FK)

One holds the Album type information : AlbumTypeID (PK), TypeDescription

I want to show the last record entered into tblAlbum of each AlbumType.

So for my album table,

AlbumID Desc AlbumTypeID

1 First Record of Type 1 1

2 Second Record of Type 1 1

3 First Record of Type 2 2

So from the SP, possibly using a DISTINCT on the AlbumTypeID, I'd hope the output to be something like:

AlbumID Desc AlbumTypeID

2 Second Record of Type 1 1

3 First Record of Type 2 2

Any clues?

|||

Hmmm

Basically, I have 2 tables,

One holds the Album information : AlbumID (PK), Album Description, Owner, DateOfCreation, AlbumTypeID (FK)

One holds the Album type information : AlbumTypeID (PK), TypeDescription

I want to show the last record entered into tblAlbum of each AlbumType.

So for my album table,

AlbumID Desc AlbumTypeID

1 First Record of Type 1 1

2 Second Record of Type 1 1

3 First Record of Type 2 2

So from the SP, possibly using a DISTINCT on the AlbumTypeID, I'd hope the output to be something like:

AlbumID Desc AlbumTypeID

2 Second Record of Type 1 1

3 First Record of Type 2 2

Any clues?

|||

Hmmm

Basically, I have 2 tables,

One holds the Album information : AlbumID (PK), Album Description, Owner, DateOfCreation, AlbumTypeID (FK)

One holds the Album type information : AlbumTypeID (PK), TypeDescription

I want to show the last record entered into tblAlbum of each AlbumType.

So for my album table,

AlbumID Desc AlbumTypeID

1 First Record of Type 1 1

2 Second Record of Type 1 1

3 First Record of Type 2 2

So from the SP, possibly using a DISTINCT on the AlbumTypeID, I'd hope the output to be something like:

AlbumID Desc AlbumTypeID

2 Second Record of Type 1 1

3 First Record of Type 2 2

Any clues?

|||

Using the additional function
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
CREATE FUNCTION [dbo].[GetFirstAlbumId]
(
@.AlbumTypeId INT
)
RETURNS INT
AS
BEGIN
DECLARE @.RETURN INT
SELECT @.RETURN = Id FROM Album WHERE Id = (SELECT Min(Id) FROM Album WHERE AlbumTypeId = @.AlbumTypeId)
RETURN @.RETURN
END

SELECT DISTINCT dbo.GetFirstAlbumId(AlbumTypeId) as a, dbo.GetFirstAlbumDescription(AlbumTypeId) as B, AlbumTypeId FROM Album

gave

a B AlbumTypeId
---- ---------- ----
1 Album 1 of 1 1
3 Album 1 of 2 2
6 Album 1 of 3 3

|||Can you provide some more sample data with same AlbumId and different AlbumTypeId's..with expected output.|||

SELECT *

FROM Albumns a

JOIN (

SELECT AlbumnTypeID,MIN(AlbumnID) AS LowestAlbumnID

FROM Albumns

GROUP BY AlbumnTypeID) t1 ON a.AlbumnID=t1.LowestAlbumnID