kdb+ and q
Q+A on all things kdb+ database and the q language
2823 PostsActivity in Discussion Forums
Why does @ need :: and why does . need () in amend?
https://code.kx.com/q/ref/amend/Based on the above, why does . need () to get the entire list and @ need ()?Surely this would imply:q) 1 2 3 4 5 . () /this is NOT the case1 2 3 4 5 and q) list @ :: /this is NOT the caselistHowever q)list @ enlist[::]...
Why are feedhandlers not usually kdb?
We often read that feedhandlers are not kdb, and usually are either java-kdb or C++, why is this the case? why is it not ideal or possible to have a kdb feedhandler?
What does it actually mean to reload a HDB? why is this needed?
We know that .Q.hdpf sends a message to the HDB to reload, but what does this actually mean? and why is it necessary?
Ashok Reddy on the Array Cast
In the latest episode of the Array Cast podcast we interview KX’s CEO, Ashok Reddy. On this episode we speak to Ashok about his experience in software development and the roles that KX, q and time-series computing will play in the future.
Most optimum way to search a column containing a list of values
Hello,I have a table with 'parent' and 'child' columns containing an id. I have another column named 'chain' that is a list containing id's of parents all the way to the root. This means that for a given row, the chain column contains the path to the...
