Re: PIVOT of data

Srikanth Rao wrote:
>Hi,
>I have a table like this:
> location | numbrochures | marketing
>-----------------------+--------------+-----------
> 101 Asheville, NC | 4 | NEWS
> 101 Asheville, NC | 1 | TV
> 101 Asheville, NC | 3 | RADIO
> 101 Asheville, NC | 2 | OTHER
> 101 Asheville, NC | 3 | null
> 101 Asheville, NC | 1 | TV
> 102 'Charlotte', 'NC' | 1 | SIGN
> 104 'Colfax', 'NC' | 5 | SIGN
> 109 'Moyock', 'NC' | 1 | BROCHURE
>(9 rows)
>
>
>I want the headings to be like:
>
>location | NEWS | TV | RADIO | OTHER | ........
>
>How to get this done using sql for postgresql backend?

SELECT location,
CASE WHEN marketing = 'NEWS'
THEN numbrochures
ELSE NULL
END AS "NEWS",
CASE WHEN marketing = 'TV'
THEN numbrochures
ELSE NULL
END AS "TV",
...

but it's a clumsy hack and won't work if you don't know the
contents of "marketing" in advance.

--
Oliver Elphick Oliver(dot)Elphick(at)lfix(dot)co(dot)uk
Isle of Wight http://www.lfix.co.uk/oliver
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