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PMeinshausen/TF_IDF.sql

Created September 29, 2014 03:17
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TF_IDF.sql
--Syntax
SELECT * FROM TF_IDF(
ON TF
(
ON {table|view|(query)} PARTITION BY docid
[FORMULA('bool'|'log'|'augment'|'normal')]
) AS TF PARTITION BY term
[ON (SELECT term, COUNT(distinct docid) FROM input_table
GROUP BY term) AS docperterm PARTITION BY term]
[ON (SELECT COUNT(distinct(docid)) FROM input_table)
AS doccount dimension]
[ON (SELECT DISTINCT(term) as term,
IDF FROM tf_idf_output_table) AS IDF PARTITION BY term]
);
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