Return DISTINCT Values

Hi,

How do I ensure that DISTINCT values of r.GPositionID are returned from the below?

Code Snippet

SELECT CommentImage AS ViewComment,r.GPositionID,GCustodian,GCustodianAccount,GAssetType

FROM @.GResults r

LEFT OUTER JOIN

ReconComments cm

ON cm.GPositionID = r.GPositionID

WHERE r.GPositionID NOT IN (SELECT g.GPositionID FROM ReconGCrossReference g)

ORDER BY GCustodian, GCustodianAccount, GAssetType;

Thanks.

You can apply the distinct key word after the select clause – if all the column set values are duplicate,

Code Snippet

SELECT Distinct

CommentImage AS ViewComment

, r.GPositionID

, GCustodian

, GCustodianAccount

, GAssetType

FROM

@.GResults r

LEFT OUTER JOIN ReconComments cm

ON cm.GPositionID = r.GPositionID

WHERE

r.GPositionID NOT IN (SELECT g.GPositionID FROM ReconGCrossReference g)

ORDER BY

GCustodian

, GCustodianAccount

, GAssetType;

If column set values (CommentImage, GCustodian, GCustodianAccount, GAssetType) are not unique you can apply group functions – it may cauase some data lose.

Code Snippet

SELECT Distinct

Max(CommentImage) AS ViewComment

, r.GPositionID

, Max(GCustodian)

, Max(GCustodianAccount)

, Max(GAssetType)

FROM

@.GResults r

LEFT OUTER JOIN ReconComments cm

ON cm.GPositionID = r.GPositionID

WHERE

r.GPositionID NOT IN (SELECT g.GPositionID FROM ReconGCrossReference g)

Group BY

r.GPositionID

ORDER BY

GCustodian

, GCustodianAccount

, GAssetType;

|||

CommentImage has dataType 'Image'

Using DISTINCT with it gives the below error...

The text, ntext, or image data type cannot be selected as DISTINCT.

|||

The following query might help you,

Select

(select Top 1 CommentImage from ReconComments s where s.GPositionID=data.GPositionID),

, GPositionID

, GCustodian

, GCustodianAccount

, GAssetType

From

(

SELECT Distinct

, r.GPositionID

, GCustodian

, GCustodianAccount

, GAssetType

FROM

@.GResults r

LEFT OUTER JOIN ReconComments cm

ON cm.GPositionID = r.GPositionID

WHERE

r.GPositionID NOT IN (SELECT g.GPositionID FROM ReconGCrossReference g)

) as data

ORDER BY

GCustodian

, GCustodianAccount

, GAssetType;

|||

Get this error...

The text, ntext, and image data types are invalid in this subquery or aggregate expression

|||Yes SQL Server 2000 cause this error..let me check the solution for this.|||r.GPositionID,GCustodian,GCustodianAcc ount,GAssetType are all from the one table.
So I want the distinct values of this table returned.

Using SLQ Server 2005

thanks.

|||

If you really use SQL Server 2005 (check using => print @.@.version) database then the following query work fine,

MS Recommandation: Change your Image datatype to varbinary(max)

Code Snippet

SELECT Distinct

Cast(CommentImage as varbinary(max)) AS ViewComment

, r.GPositionID

, GCustodian

, GCustodianAccount

, GAssetType

FROM

@.GResults r

LEFT OUTER JOIN ReconComments cm

ON cm.GPositionID = r.GPositionID

WHERE

r.GPositionID NOT IN (SELECT g.GPositionID FROM ReconGCrossReference g)

ORDER BY

GCustodian

, GCustodianAccount

, GAssetType;

|||

When I click the 'Help' > 'About' link it tells me its Microsoft SQL Server 2005.

Using

print @.@.version

tells me this...

Microsoft SQL Server 2000 - 8.00.878 (Intel X86)

|||

That means you connected SQL Server 2000 server from the Management Studio (2005 Client tool).

Let me clarify where the images are stored - is it in different table (ReconComments) .

Is there any possibilty to have duplicate images for one GPositionID.

|||Sorry - it is possible for one GPositionID to have duplicate images.|||

GPositionID and GCustodian are in the one table.
CommentImage is from a related table.

There is a M:M relation.

Here's the tables structure:

RComments Tbl:

RCommentsID int PK,
CommentImage image,
GPositionID int FK

@.GResults Tbl:

GPositionID int PK,
GCustodian varchar(250),
GCustodianAccount varchar(250),
GAssetType varchar(250)