PostgreSQL is sexy

What used to be two stored procedures (of which one was recursive), two temporary VIEWs and several subqueries in PostgreSQL 8.3, has now been reduced to one, simple and elegant query in 8.4. Thanks to the introduction of WITH queries. (and some optimization on my part, I can't say my previous solution was really efficient)

INSERT INTO tags_vn_inherit   WITH RECURSIVE tags_vn_all(lvl, tag, vid, uid,                              vote, spoiler, meta) AS (       SELECT 15, tag, vid, uid, vote, spoiler, false       FROM tags_vn     UNION ALLSELECT lvl-1, tp.parent, ta.vid, ta.uid,              ta.vote, ta.spoiler, t.meta       FROM tags_vn_all ta       JOIN tags_parents tp ON tp.tag = ta.tag       JOIN tags t ON t.id = tp.parent       WHERE t.state = 2         AND ta.lvl > 0   )   SELECT tag, vid, COUNT(uid) AS users,          AVG(vote)::real AS rating,          (CASE WHEN AVG(spoiler)< 0.7 THEN 0                WHEN AVG(spoiler)> 1.3 THEN 2                ELSE 1          END)::smallint AS spoiler   FROM (     SELECT tag, vid, uid, MAX(vote)::real,            COALESCE(AVG(spoiler), 0)::real     FROM tags_vn_all     WHERE NOT meta     GROUP BY tag, vid, uid   ) AS t(tag, vid, uid, vote, spoiler)   GROUP BY tag, vid   HAVINGAVG(vote)> 0; 

Isn't that just cute?

(Sorry, I'm too lazy to explain what that query does, just check the PostgreSQL docs and our database structure if you absolutely need to know)