E.g if I wanted to select * from foo where last_updated <= ? In this case, (I believe) last_updated will have to be a clustering key. If the record got updated and I wanted to update last_updated accordingly, that's a bad idea?
:S On Tue, Oct 11, 2016 at 3:19 AM, Ali Akhtar <ali.rac...@gmail.com> wrote: > Huh - So if I wanted to search / filter by a timestamp field, and this > timestamp needed to get updated, that won't be possible? > > On Tue, Oct 11, 2016 at 3:07 AM, Nicolas Douillet < > nicolas.douil...@gmail.com> wrote: > >> If I correctly understand the answers, the solution to your ordering >> question is to use clustering keys. >> I'm agree, but I just wanted to warn you about one limitation : the >> values of keys can't be updated, unless by using a delete and then an >> insert. >> (In the case of your song "example", putting the rate as a key can be >> tricky if the value has to be frequently updated) >> >> >> Le lun. 10 oct. 2016 à 22:15, Mikhail Krupitskiy < >> mikhail.krupits...@jetbrains.com> a écrit : >> >>> Looks like ordering by multiple columns in Cassandra has few sides that >>> are not obvious. >>> I wasn’t able to find this information in the official documentation but >>> it’s quite well described here: >>> http://stackoverflow.com/questions/35708118/where-and-order- >>> by-clauses-in-cassandra-cql >>> >>> Thanks, >>> Mikhail >>> >>> On 10 Oct 2016, at 21:55, DuyHai Doan <doanduy...@gmail.com> wrote: >>> >>> No, we didn't record the talk this time unfortunately :( >>> >>> On Mon, Oct 10, 2016 at 8:17 PM, Ali Akhtar <ali.rac...@gmail.com> >>> wrote: >>> >>> Really helpful slides. Is there a video to go with them? >>> >>> On Sun, Oct 9, 2016 at 11:48 AM, DuyHai Doan <doanduy...@gmail.com> >>> wrote: >>> >>> Yes it is possible, read this: http://www.slideshare.ne >>> t/doanduyhai/datastax-day-2016-cassandra-data-modeling-basics/24 >>> >>> and the following slides >>> >>> On Sun, Oct 9, 2016 at 2:04 AM, Ali Akhtar <ali.rac...@gmail.com> wrote: >>> >>> Is it possible to have multiple clustering keys in cassandra, or some >>> other way to order by multiple columns? >>> >>> For example, say I have a table of songs, and each song has a rating and >>> a date. >>> >>> I want to sort songs by rating first, and then with newer songs on top. >>> >>> So if two songs have 5 rating, and one's date is 1st Feb, the other is >>> 2nd Feb, then I want the 2nd feb one to be sorted above the 1st feb one. >>> >>> Like this: >>> >>> Select * from songs order by rating, createdAt >>> >>> Is this possible? >>> >>> >>> >>> >>> >>> >
