And maybe not on the wall, but instead in your SQLz, eating your data. But a bit more seriously. Ever since PostgreSQL 8.4 we have window functions, but still I see people which do not know it or are wary to ...
Let's assume you have some simple database with "articles" - each article can be in many "categories". And now you want to get list of all articles in given set of categories. Standard approach: select a.* from ...
On 1st of Februyary, Takahiro Itagaki committed a patch by Pavel Stehule which adds string_agg aggregate: Log Message: ----------- Add string_agg aggregate functions. The one argument version concatenates the input values into a string. The two argument version also does the same thing, but inserts ...
On 15th of December Tom Lane committed patch by Andrew Gierth (aka RhodiumToad), which adds interesting capability: Log Message: ----------- Support ORDER BY within aggregate function calls, at long last providing a non-kluge method for controlling the order in which values are fed to ...
Today, on irc (#postgresql on freenode.net) Dim mentioned about writing median calculation code. It got me thinking, and consequently writing my version of median calculation code.
A long overdue post about new functionality. At this moment it is no longer such new, as it was committed on 28th of December (yes, I know, I should have written it earlier, Sorry). On this day Tom Lane committed patch ...
Finally, we got very important addons to PostgreSQL, which help with dealing with arrays. It solves a lot of problems, which were usually solved with standard cookbook code, which was in faqs, blog posts and number of examples on irc.
