Question

Paging?

Asked by: amoran

Hi

I do this

SELECT * FROM (SELECT ROWNUM rnum, english FROM
(SELECT SYSTEM_DATA.SD_ID,LANGUAGE_SD_COMPANY_APPLICABLE.SD_Table_Primary_Key,LANGUAGE_SD_COMPANY_APPLICABLE.Company_No,English
FROM SYSTEM_DATA,LANGUAGE_SD_COMPANY_APPLICABLE WHERE SYSTEM_DATA.SD_ID=LANGUAGE_SD_COMPANY_APPLICABLE.SD_ID
AND SYSTEM_DATA.Implementation_ID =16 AND LANGUAGE_SD_COMPANY_APPLICABLE.Implementation_ID =16 AND LANGUAGE_SD_COMPANY_APPLICABLE.SD_ID=63
ORDER BY SYSTEM_DATA.Implementation_ID, SYSTEM_DATA.SD_ID,UPPER(LANGUAGE_SD_COMPANY_APPLICABLE.English) ASC) ) WHERE ROWNUM BETWEEN 1 AND 10

and

SELECT * FROM (SELECT ROWNUM rnum, english FROM
(SELECT SYSTEM_DATA.SD_ID,LANGUAGE_SD_COMPANY_APPLICABLE.SD_Table_Primary_Key,LANGUAGE_SD_COMPANY_APPLICABLE.Company_No,English
FROM SYSTEM_DATA,LANGUAGE_SD_COMPANY_APPLICABLE WHERE SYSTEM_DATA.SD_ID=LANGUAGE_SD_COMPANY_APPLICABLE.SD_ID
AND SYSTEM_DATA.Implementation_ID =16 AND LANGUAGE_SD_COMPANY_APPLICABLE.Implementation_ID =16 AND LANGUAGE_SD_COMPANY_APPLICABLE.SD_ID=63
ORDER BY SYSTEM_DATA.Implementation_ID, SYSTEM_DATA.SD_ID,UPPER(LANGUAGE_SD_COMPANY_APPLICABLE.English) ASC) ) WHERE ROWNUM BETWEEN 11 AND 20

the first one works fine but the second doesnt display any results even though it should

have i missed something?

thanks
AM

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Asked On
2005-05-03 at 09:12:41ID21411048
Tags

paging

Topic

Oracle Database

Participating Experts
2
Points
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Comments
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Answers

 

by: amoranPosted on 2005-05-03 at 09:24:31ID: 13919342

ok this is odd
when i change my second sql to
1 and 20
i get 20 results!

 

by: awking00Posted on 2005-05-03 at 09:48:58ID: 13919537

The reason is that rownum is not an attribute of the table but is an element of the result set. You will never get results where the first value for rownum is greater than 1, since the query returns the first row and its rownum is 1 but doesn't meet the where clause so it returns the second row and its rownum is also 1, etc.
For example, none of the following queries will return results:
Select * from table where rownum =2;
Select * from table where rownum >1;
Select * from table where rownum between 2 <or greater> and <anything>;

To get rows between 11 and 20, you need to do the following:
Select * from table where rownum < 21
minus
Select * from table where rownum <11;




 

by: Bigfam5Posted on 2005-05-03 at 09:50:11ID: 13919549

A more effecient method is (instead of using BETWEEN)

select * from
    (select rownum rnum, english from
           (select system_data.sd_id,language_sd_company_applicable.sd_table_primary_key,
                   language_sd_company_applicable.company_no,english
               from system_data,language_sd_company_applicable
               where system_data.sd_id=language_sd_company_applicable.sd_id
                 and system_data.implementation_id =16
                 and language_sd_company_applicable.implementation_id =16
                 and language_sd_company_applicable.sd_id=63
            order by system_data.implementation_id, system_data.sd_id,
                     upper(language_sd_company_applicable.english) asc )
      WHERE ROWNUM <= 10) -- this is the last row you would like
WHERE RNUM >= 1               -- this is the first row you would like

 

by: awking00Posted on 2005-05-03 at 09:53:12ID: 13919582

Added note - I think minus may only be available in Oracle 9 or later.

 

by: awking00Posted on 2005-05-03 at 10:05:13ID: 13919684

If minus is not available using sub-select as Bigfam5 suggests will work.
select * from (select * from table where rownum <=20)
where rownum > 10;

20120131-EE-VQP-002

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