Hi Jack, So what will be the keys and values of the following CF instance?
year | category | frequency | word1 | word2 | id ------+----------+-----------+------------------+-------------+------- 2014 | N | 1 | සියළුම | යුද්ධ | 664 2014 | N | 1 | එච් | කාණ්ඩය | 12526 2014 | N | 1 | ගජබා | සුපර්ක්රොස් | 25779 2014 | N | 1 | බී| කාණ්ඩය | 12505 Thank You! On Tue, Dec 16, 2014 at 6:45 PM, Jack Krupansky <j...@basetechnology.com> wrote: > > Correction: year and category form a “composite partition key”. > > frequency, word1, and word2 are “clustering columns”. > > The combination of a partition key with clustering columns is a “compound > primary key”. > > Every CQL row will have a partition key by definition, and may optionally > have clustering columns. > > “The key” should just be a synonym for “primary key”, although sometimes > people are loosely speaking about “the partition” (which should be “the > partition key”) rather than the CQL “row”. > > -- Jack Krupansky > > *From:* Chamila Wijayarathna <cdwijayarat...@gmail.com> > *Sent:* Tuesday, December 16, 2014 8:03 AM > *To:* user@cassandra.apache.org > *Subject:* Understanding what is key and partition key > > Hello all, > > I have read a lot about Cassandra and I read about key-value pairs, > partition keys, clustering keys, etc.. > Is key mentioned in key-value pair and partition key refers to same or are > they different? > > > CREATE TABLE corpus.bigram_time_category_ordered_frequency ( > id bigint, > word1 varchar, > word2 varchar, > year int, > category varchar, > frequency int, > PRIMARY KEY((year, category),frequency,word1,word2)); > > > In this schema, I know (year, category) is the compound partition key and > frequency is the clustering key. What is the key here? > > > Thank You! > > -- > *Chamila Dilshan Wijayarathna,* > SMIEEE, SMIESL, > Undergraduate, > Department of Computer Science and Engineering, > University of Moratuwa. > -- *Chamila Dilshan Wijayarathna,* SMIEEE, SMIESL, Undergraduate, Department of Computer Science and Engineering, University of Moratuwa.
