Perhaps you should learn more about Cassandra before you ask such questions.
It's easy if you just look at the readily accessible docs. ml On Sat, Feb 14, 2015 at 6:05 PM, Raj N <raj.cassan...@gmail.com> wrote: > I don't think thats solves my problem. The question really is why can't we > use ranges for both time columns when they are part of the primary key. > They are on 1 row after all. Is this just a CQL limitation? > > -Raj > > On Sat, Feb 14, 2015 at 3:35 AM, DuyHai Doan <doanduy...@gmail.com> wrote: > >> "I am trying to get the state as of a particular transaction_time" >> >> --> In that case you should probably define your primary key in another >> order for clustering columns >> >> PRIMARY KEY (weatherstation_id,transaction_time,event_time) >> >> Then, select * from temperatures where weatherstation_id = 'foo' and >> event_time >= '2015-01-01 00:00:00' and event_time < '2015-01-02 >> 00:00:00' and transaction_time = 'xxxx' >> >> >> >> On Sat, Feb 14, 2015 at 3:06 AM, Raj N <raj.cassan...@gmail.com> wrote: >> >>> Has anyone designed a bi-temporal table in Cassandra? Doesn't look like >>> I can do this using CQL for now. Taking the time series example from well >>> known modeling tutorials in Cassandra - >>> >>> CREATE TABLE temperatures ( >>> weatherstation_id text, >>> event_time timestamp, >>> temperature text, >>> PRIMARY KEY (weatherstation_id,event_time), >>> ) WITH CLUSTERING ORDER BY (event_time DESC); >>> >>> If I add another column transaction_time >>> >>> CREATE TABLE temperatures ( >>> weatherstation_id text, >>> event_time timestamp, >>> transaction_time timestamp, >>> temperature text, >>> PRIMARY KEY (weatherstation_id,event_time,transaction_time), >>> ) WITH CLUSTERING ORDER BY (event_time DESC, transaction_time DESC); >>> >>> If I try to run a query using the following CQL, it throws an error - >>> >>> select * from temperatures where weatherstation_id = 'foo' and >>> event_time >= '2015-01-01 00:00:00' and event_time < '2015-01-02 >>> 00:00:00' and transaction_time < '2015-01-02 00:00:00' >>> >>> It works if I use an equals clause for the event_time. I am trying to >>> get the state as of a particular transaction_time >>> >>> -Raj >>> >> >> >
