Cranky

http://pipetalk.quest-pipelines.com/default.asp?boardid=mysql

And ask questions about mysql that a very knowledgable fellow named Andrew Gilfrin (among others) will answer for you. Tell him I sent you. :)

Crossing my fingers that the brackets survive posting.

A Visual Introduction to SQL by Chappel et. al. is a very straightforward, readable, and usable introduction to this kind of stuff. It has been in print for 20 years so I guess others think the same! I actually prefer the 1st edition (blue cover) to the 2nd edition (white and green cover) if you can find one used.

Cranky

SELECT u.user_nickname, c.category_nicename, COUNT FROM `wp_users` u INNER JOIN wp_posts p ON u.ID = p.post_author INNER JOIN wp_post2cat pc ON p.ID = pc.post_id INNER JOIN wp_categories c ON pc.category_id = c.cat_ID GROUP BY u.user_nickname, c.category_nicename

It’s not in the table format you want, but I’d do that part in PHP or something rather than trying to do it in the query—which you could do with something long and hard-coded like

SELECT u.user_nickname,
COUNT AS category_name1_count,
COUNT AS category_name2_count,
…
FROM `wp_users` u INNER JOIN wp_posts p ON u.ID = p.post_author INNER JOIN wp_post2cat pc ON p.ID = pc.post_id INNER JOIN wp_categories c ON pc.category_id = c.cat_ID GROUP BY u.user_nickname

Start out with the following. I won’t guarantee that it’s valid mysql syntax (though it is correct sql syntax)—but it should be close enough that anyone that’s worked with mysql even a bit can get it the rest of the way to a correct phrasing.

SELECT u.user-nicename,
c.category-nicename
FROM wp-users u,
wp-posts p,
wp-post2cat pc,
wp-categories c
WHERE p.post-author = u.id
AND pc.post-id = p.id
AND c.cat-id = pc.category-id;

This should give you all of the author/category pairings. Now to summarize them and count combinations you change this to the following:

SELECT u.user-nicename,
c.category-nicename,
COUNT AS post-cnt
FROM wp-users u,
wp-posts p,
wp-post2cat pc,
wp-categories c
WHERE p.post-author = u.id
AND pc.post-id = p.id
AND c.cat-id = pc.category-id
GROUP BY
u.user-nicename,
c.category-nicename;

If you’ve gotten this far, then you almost certainly want to simply pull the results into a tool like Excel and pivot things from there. If you’re feeling bold, then you can…

SELECT u.user-nicename,
COUNT) AS academia-cnt,
COUNT) AS blogging-cnt,
COUNT) AS etc-cnt
FROM wp-users u,
wp-posts p,
wp-post2cat pc,
wp-categories c
WHERE p.post-author = u.id
AND pc.post-id = p.id
AND c.cat-id = pc.category-id
GROUP BY
u.user-nicename;

This is saying: 1) group by user, 2) count occurances of “this funny decode thing”. I won’t guarantee that mysql supports the function decode(), but here’s what it does so that you can look for a suitable replacement. It maps a value, in our case category, to a list of pairs of values. In the first case we want to compare the category with ‘academia’ and if it matches then we count up ‘x’, if it does not match then we count up nothing (called NULL in databases). So this counts the number of occurances of ‘academia’. The next column similarly counts the number of occurances of ‘blogging’, and you would add additional columns similiarly.

As the cranky indicated though, you’ll have to keep this up to date manually as you add/remove categories.

Cheers,
Scott

select wp-posts.post-author,
wp-post2cat.category-id,
count(*)
from wp-posts,
wp-post2cat
where wp-posts.ID = wp-post2cat.post-id
group by wp-posts.post-author,
wp-post2cat.category-id
order by wp-posts.post-author,
wp-post2cat.category-id

Why don’t you see if that works, and if so I can add in the fancy names if you want.

Cranky

TIA