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SQL2005: DISTINCT with ROW_NUMBER() ...multiple results

Posted on 2006-06-24
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Last Modified: 2008-02-01
Hi all

I had this query working when I used default paging in my ASP.NET datagrids

SELECT
      DISTINCT APE.*
FROM
      eHR_Accred_Practice_Example APE INNER JOIN
      eHR_Accred_Principle AP ON APE.principle = AP.principle_id INNER JOIN
      eHR_Accred_Quality_Area AQA ON AP.quality_area = AQA.area_id
WHERE
      APE.org_code = '000037'
      AND AQA.area_abbr = 'QA2'


 ... but now I want to use the new SQL2005 row_number() feature and use custom paging in my ASp.NET datagrids to only return a set number of results (Example results 0 - 10 page 1, 10-20 page 2 etc.).

So I wrote this and I can't seem to integrate the 'DISTINCT' in anywhere to stop the query returning multiple results of exactly the same thing (minus the RowNum of course ...that's incrementing perfectly as it should):

SELECT
      RowNum,  
      example_id,  
      date_of_exam,  
      principle,
      description,  
      example,
      notes,  
      org_code
FROM
      (
      SELECT
            ROW_NUMBER() OVER(ORDER BY eHR_Accred_Practice_Example.example_id) as RowNum,  
            eHR_Accred_Practice_Example.example_id As example_id,  
             eHR_Accred_Practice_Example.date_of_exam As date_of_exam,  
             eHR_Accred_Practice_Example.principle As principle,
             eHR_Accred_Practice_Example.description As description,  
             eHR_Accred_Practice_Example.example As example,
             eHR_Accred_Practice_Example.notes As notes,  
             eHR_Accred_Practice_Example.org_code As org_code      
      FROM
            eHR_Accred_Practice_Example
            LEFT JOIN eHR_Accred_Principle ON eHR_Accred_Practice_Example.principle = eHR_Accred_Principle.principle_id
            LEFT JOIN eHR_Accred_Quality_Area ON eHR_Accred_Principle.quality_area = eHR_Accred_Quality_Area.area_id
      WHERE
            eHR_Accred_Practice_Example.org_code = '000037'                  
            AND eHR_Accred_Quality_Area.area_abbr = 'QA2'
      ) as TableInfo
WHERE RowNum BETWEEN 0 AND 10

THAT query returns these multiple results:

1,      000033,      NULL,      000021,      '', '', '',      000037
2,      000033,      NULL,      000021,      '', '', '',      000037
3,      000033,      NULL,      000021,      '', '', '',      000037
4,      000033,      NULL,      000021,      '', '', '',      000037
... etc

I need the results to be unique ...as in only show me ONE of the example_ids 000033, then the next like so:
1,      000033,      NULL,      000021,      '', '', '',      000037
2,      000034,      NULL,      000021,      'testing', '', '',      000037

 ...can anyone help please?


Here's my schema for all the tables mentioned above:

CREATE TABLE [dbo].[eHR_Accred_Practice_Example](
      [example_id] [varchar](6) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
      [date_of_exam] [datetime] NULL,
      [principle] [varchar](6) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
      [description] [varchar](200) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [example] [varchar](1000) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [notes] [varchar](1000) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [org_code] [varchar](6) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
 CONSTRAINT [PK_eHR_Accred_Practice_Example] PRIMARY KEY CLUSTERED
(
      [example_id] ASC,
      [org_code] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

CREATE TABLE [dbo].[eHR_Accred_Principle](
      [principle_id] [varchar](6) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
      [principle_name] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [principle_description] [varchar](1000) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [quality_area] [varchar](6) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [org_code] [varchar](6) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
      [isDefault] [varchar](1) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
 CONSTRAINT [PK_eHR_Accred_Principle] PRIMARY KEY CLUSTERED
(
      [principle_id] ASC,
      [org_code] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

CREATE TABLE [dbo].[eHR_Accred_Quality_Area](
      [area_id] [varchar](6) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
      [area_name] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [area_abbr] [varchar](10) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
      [org_code] [varchar](6) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
      [isDefault] [varchar](1) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
 CONSTRAINT [PK_eHR_Accred_Quality_Area] PRIMARY KEY CLUSTERED
(
      [area_id] ASC,
      [org_code] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]


Many thanks :-)
Mark
0
Comment
Question by:msiedle
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2 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 2000 total points
ID: 16974364
any better with this:

SELECT
     RowNum,  
     example_id,  
     date_of_exam,  
     principle,
     description,  
     example,
     notes,  
     org_code
FROM
( SELECT ROW_NUMBER() OVER(ORDER BY example_id) as RowNum,  *
   FROM
     (
     SELECT DISTINCT
          eHR_Accred_Practice_Example.example_id As example_id,  
           eHR_Accred_Practice_Example.date_of_exam As date_of_exam,  
           eHR_Accred_Practice_Example.principle As principle,
           eHR_Accred_Practice_Example.description As description,  
           eHR_Accred_Practice_Example.example As example,
           eHR_Accred_Practice_Example.notes As notes,  
           eHR_Accred_Practice_Example.org_code As org_code    
     FROM
          eHR_Accred_Practice_Example
          LEFT JOIN eHR_Accred_Principle ON eHR_Accred_Practice_Example.principle = eHR_Accred_Principle.principle_id
          LEFT JOIN eHR_Accred_Quality_Area ON eHR_Accred_Principle.quality_area = eHR_Accred_Quality_Area.area_id
     WHERE
          eHR_Accred_Practice_Example.org_code = '000037'              
          AND eHR_Accred_Quality_Area.area_abbr = 'QA2'
  ) as Intermediate
 ) as TableInfo
WHERE RowNum BETWEEN 0 AND 10
0
 
LVL 2

Author Comment

by:msiedle
ID: 16980543
Thanks angelIII ...works perfectly! :-)

Cheers,
Mark
0

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