Re: PIVOT of data

Srikanth,

Aside from seconding Tim (your database is *not* normalized), the PIVOT
function is only available one of 2 ways:

SQL-ONLY, FIXED COLUMN: If you know your categories in advance, you can
write a complex view using outer joins, sub-selects, and aggregates.
Imagine that we know your types of marketing to be limited to TV, NEWS
and POSTER:

SELECT client_address, tv_totals.totaltv, news_totals.totalnews,
poster_totals.totalposter
FROM clients
LEFT OUTER JOIN (
SELECT client_address, sum(tv_spots) as totaltv
FROM clients
GROUP BY client_address ) AS tv_totals
ON tv_totals.client_address = clients.client_address
LEFT OUTER JOIN (
SELECT client_address, sum(news_ads) as totalnews
FROM clients
GROUP BY client_address ) AS news_totals
ON news_totals.client_address = clients.client_address
LEFT OUTER JOIN (
SELECT client_address, sum(posters) as totalposters
FROM clients
GROUP BY client_address ) AS poster_totals
ON poster_totals.client_address = clients.client_address;

DYNAMIC METHOD: This requires an external programming language, and I'm
not going to write it for you! However, pick you favorite procedural
language (tcl, perl, or C) and write the following:

1. Do an select distinct to obtain each value in the column you want to
use in the headers. Load this series into an array.

2. Dynamically generate query text, adding a column and a LEFT OUTER
JOIN as above into the query for each value in your array.

This method is a lot of work for both you and the server. Why do you
think that MS Access often crashes on a large "crosstab" query?

-Josh Berkus

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