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 Query for making a report - Row to column
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Posted - 04/25/2013 :  07:45:26  Show Profile  Reply with Quote

I am attempting to pull out data from a PostgreSQL database(standard SQL syntax) and use this data to create a report of user data from a system.

It is important that I get unique rows of each user, since having more than one will result in the report containing multiple records of the same person.

Here are the tables that I work with:




The identity_id(Table1) equals the cat_item_id(Table2).
The attribute_id(Table2) equals attribute_id(Table3).

What I want as output, is a row per identity_id, that looks like this:


So it sort of converts all the rows in Table 2, into 1 row, and at the same time, pulls the display_value of each of them, from Table3, and uses it as the column header, while putting in the value for that specific attribute(from Table2). I am able to get a table with all the data, but with a record for each attribute_id, which I can't use unfortunately. It would become a very spammy report.

Anyone able to crack this one, cause my brain can't!


Edited by - jacmarpet on 04/25/2013 07:57:22

Flowing Fount of Yak Knowledge

2242 Posts

Posted - 04/25/2013 :  07:53:02  Show Profile  Reply with Quote
In SQL Server, we can use PIVOT for this kind of queries
I think you need query for PostgreSQL.. Its better to post in specific forums of PostgreSQL....
There might be syntactical differences between SQL Server and PostgreSQL

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Flowing Fount of Yak Knowledge

2242 Posts

Posted - 04/25/2013 :  08:06:20  Show Profile  Reply with Quote
In SQL Server, the solution looks like this...
FROM (SELECT t1.*, t3.*
		FROM Table1 t1 
		JOIN Table2 t2 ON t1.identity_id = t2.cat_item_id
		JOIN Table3 t3 ON t3.attribute_id = t2.attribute_id
	) p
PIVOT (SELECT MAX(display_value) FOR attribute_name IN ([XATTRIB-CPR], [XATTRIBEmail], [XATTRIBPrimaryEmpaffiliation], [XATTRIBWFInitiator] ))pvt

EDIT: This link may help you for PostgrSQL query

Edited by - bandi on 04/25/2013 08:09:37
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