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The following page has been changed by udanax: http://wiki.apache.org/lucene-hadoop/Hbase/HbaseShell The comment on the change is: add a comment ------------------------------------------------------------------------------ = Project Links = * [:Hbase/HbaseShell/HQL: Hbase Query Language] Data Manipulation Statements that help manipulate data in the Hbase * [:Hbase/RDF: HbaseRDF] for storing and querying RDF data. - * [:ShellPlans: Shell Plans] page for discussion and description of future operators. + * [:Hbase/HbaseShell/ShellPlans: Shell Plans] page for discussion and description of future operators. ---- = Initial Contributor = * [:udanax:Edward Yoon] (R&D center, NHN corp.) @@ -172, +172 @@ = Comments = Please add comments related to the project below. + ---- + Commented by [:udanax: Edward yoon] 2007/09/18 + '''Case 1 : My initial style''' + + {{{ + Hbase > A = table('movieLog_table'); + Hbase > B = A.Group('RunningTime', SUM('vote')); + Hbase > Store B to table('m_table'); + }}} + + '''Case 2 : SQL style''' + + {{{ + Hbase > CREATE TABLE m_table ('vote'); + Hbase > INSERT INTO m_table ('vote') + --> SELECT * FROM + --> (SELECT + --> RunningTime, + --> sum('vote:user1') vote:user1, + --> sum('vote:user2') vote:user2, + --> sum('vote:user3') vote:user3, + --> sum('vote:user4') vote:user4 + ... + .. + --> FROM movieLog_table + --> GROUP BY RunningTime) + --> ORDER BY 1; + }}} + + In either case, return the same results. + + '''m_table : ''' + + {{{ + Row Columnfamilies + ------------ ---------------------------------- + RunningTime vote ... + ------------ ------------------- ---------- + 112 vote:user2 1100 ... + vote:user4 1500 + 124 vote:user3 1600 + 125 vote:user3 2850 + 131 vote:user1 2450 + vote:user4 3050 + ... + }}} + + The expected A matrix of (Movie Running Time by User) would be as sampled below : + [[BR]]Note : Cell data is an aggregate value of voting. + + {{{ + Vote:user1 vote:user2 vote:user3 vote:user4 + ---------- ---------- ---------- ---------- ---------- + 112 1100 1500 + 124 1600 + 125 2850 + 131 2450 3050 + }}} + + Now, you want the analysis to find a unknown relationship between User and Movie Running Time? + + {{{ + Hbase > ok, you can find a unknown relationship using the algebraic operations. + }}} + + So, Here's my questions. + + * What is a better syntax for Multi-dimensional Algebraic Operations commands? + * I don't think Sub-Shell(Separated Altools) is good. How think about it? + * Should i attempt to imitate SQL? I think it may be more difficult than we expected. + + Any comments are welcomed. + [[BR]]Thank you. +
