How to do this ?

Esmin Gracic wrote:

On Wed, May 18, 2011 at 1:25 PM, Adarsh Sharma
<adarsh.sharma@orkash.com <mailto:adarsh.sharma@orkash.com>> wrote:

Dear all,

I explain in the simple terms :

Our application stores data in a format that is not best
fitted to analyze.

_*Table news

*_category_id Record_id field_name field_value

78 21 Village
adasrpur
78 21 SOI
media
78 21 Heading
CM dies
78 21 Description
In the agdadjkagdasgdjkhasdkajhgdhjsajhdgasdhgaksgda .....

80 22 SOI
media
80 22 Units
in the armed forces
80 22 EventLoc
kashmir
80 22 GR
encounter
80 22 Other Perspective ""
80 22 Heading
A bomb takes 100 lives

78 23 Village
chattarpur
78 23 SOI
media
78 23 Heading
PM address nation
78 23 Description
on the eve of Republic day Pm addresses nation and ensures safety
asjhdgakhgdjla....

80 22 SOI
media
80 22 Units
military academy
80 22 EventLoc
Hyderabad
80 22 GR
firing
80 22 Other Perspective ""
80 22 Heading
militantas have a firing near military academy

_*category_table :

*_category_id category_name
78 Political
80 Criminal
..........
.........
....

Problem :-

1. There are more than 40000 rows and different *category_id* have
different number of rows ( field_name,fild_values)
2. There may be case when different *category_id's* have different
*field_name.
3. *In future there may be 1000 of categories and millions of news.
*
Requirement :

* We want the desired data in horizontal format and field_name
becomes the table columns for e.g ;

A user inputs category = Criminal then output will be :

*category_id category_name SOI
Units EventLoc GR
Other Perspective Heading*
80 Criminal media
in the armed forces Kashmir encounter
"" A bomb takes 100 lives
80 Criminal media
military academy Hyderabad firing
"" militantas have a firing near
military academy

||rly catgory_id 78 has also its rows.

Note that on other category_id column names may change.

My procedure :
1. create a temporary table depending upon *field_name* column of
the corresponding id.
2. Load data in it from user_news table.
3. Select data from the temporary table.

I am not able to load data.
Please guide what is the correct way to achieve this.

I attach my procedure. Please let me know if any other information
is required.

I can do it myself if someone show me the path to do this

Thanks & best Regards
Adarsh Sharma

create function user_news_new(text) returns void as $$

declare

name text;
cat_name alias for $1;

begin

CREATE TEMPORARY TABLE temptest(category_id INTEGER,category_name
text);

for name in select label_name from category_labels where
category_id = (select category_id from category where
category_name=cat_name) loop

execute 'alter table temptest add column ' || name || ' text';

end loop;

select * from user_news where category_id=

end;

$$ language plpgsql;

/* category_label table contains all the field_name entries of
category_id's */

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This looks like good candidate for "pivot" or "crosstab" functions.
Had done something similar under Oracle, but in postgresql, there is
tablefunc
<http://www.postgresql.org/docs/current/static/tablefunc.html&gt;in
contrib. Hope that helps.

***************************************************************************************************************************************************
Thanks for your suggestions :

After following the below link

http://www.postgresql.org/docs/current/static/tablefunc.html

I have a doubt in mind, If i use the crosstab function as

SELECT *
FROM crosstab(
'select rowid, attribute, value
from ct
where attribute = ''att2'' or attribute = ''att3''
order by 1,2')
AS ct(row_name text, category_1 text, category_2 text, category_3 text);

row_name | category_1 | category_2 | category_3
----------+------------+------------+------------
test1 | val2 | val3 |
test2 | val6 | val7 |

Output is generated but it is static, fore.g we have to mention all the output colummn names in the beginning but my column names also be different w.r.t different category_id's

ct(row_name text, category_1 text, category_2 text, category_3 text);

We have to give column names as shown above but it depends upon different category_id', they may be different.

Thanks
(2 rows)

Any update on this.

Please guide.

Adarsh Sharma wrote:

Dear all,

I explain in the simple terms :

Our application stores data in a format that is not best fitted
to analyze.

_*Table news

*_category_id Record_id field_name field_value

78 21 Village
adasrpur
78 21 SOI
media
78 21 Heading CM dies
78 21 Description In
the agdadjkagdasgdjkhasdkajhgdhjsajhdgasdhgaksgda .....

80 22 SOI
media
80 22 Units
in the armed forces
80 22 EventLoc
kashmir
80 22 GR
encounter
80 22 Other Perspective ""
80 22 Heading
A bomb takes 100 lives

78 23 Village
chattarpur
78 23 SOI
media
78 23 Heading PM
address nation
78 23 Description on
the eve of Republic day Pm addresses nation and ensures safety
asjhdgakhgdjla....

80 22 SOI
media
80 22 Units
military academy
80 22 EventLoc
Hyderabad
80 22 GR
firing
80 22 Other Perspective ""
80 22 Heading
militantas have a firing near military academy

_*category_table :

*_category_id category_name
78 Political
80 Criminal
..........
.........
....

Problem :-

1. There are more than 40000 rows and different *category_id* have
different number of rows ( field_name,field_values)
2. There may be case when different *category_id's* have different
*field_name.
3. *In future there may be 1000 of categories and millions of news.
*
Requirement :

* We want the desired data in horizontal format and field_name becomes
the table columns for e.g ;

A user inputs category = Criminal then output will be :

*category_id category_name SOI Units
EventLoc GR Other
Perspective Heading*
80 Criminal media in
the armed forces Kashmir encounter ""
A bomb takes 100 lives
80 Criminal media
military academy Hyderabad firing ""
militantas have a firing near military
academy

||rly catgory_id 78 has also its rows.

Note that on other category_id column names may change.

My procedure :
1. create a temporary table depending upon *field_name* column of the
corresponding id.
2. Load data in it from user_news table.
3. Select data from the temporary table.

I am not able to load data.
Please guide what is the correct way to achieve this.

I explain the procedure below. Please let me know if any other
information is required.

I can do it myself if someone show me the path to do this

Thanks & best Regards
Adarsh Sharma

****************************
create function user_news_new(text) returns void as $$

declare

name text;
cat_name alias for $1;

begin

CREATE TEMPORARY TABLE temptest(category_id INTEGER,category_name text);

for name in select label_name from category_labels where category_id =
(select category_id from category where category_name=cat_name) loop

execute 'alter table temptest add column ' || name || ' text';

end loop;

select * from user_news where category_id=

end;

$$ language plpgsql;

/* category_label table contains all the field_name entries of
category_id's */

********************************************************