sql - Query to calculate term frequency * inverse document frequency -


i have 2 tables in oracle database:

  1. df (term, doccount)
  2. tf (abstractid, term, freq)

one document frequency(df) having terms , documentcount , table term frequency called tf havind documentid, terms, frequency. want calculate tf*idf tf = number of times term appears in article (frequency column table tf) , idf = log (132225)-log(doccount)+1

i want store result in table (tfidf) having documentid, terms , calculated tf*idf

any ideas?

you need join tf , df tables , insert destination tfidf table. try this:

insert tfidf (documentid, terms, tf_idf) select abstractid, df.term, (log(10, 132225)-log(10, doccount)+1)*(tf.freq) tf, df tf.term = df.term;

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