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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