Result evaluation

Our suppliers tag records with large number of keywords (which we will then index with a context index). They use every possible Word, just in case variant. So I could see "surfboard, surfboarder, surf, surfboarded, surfboards, surfborders, the surfboardings and so on."

When someone seeks contains (textfield, $surfboard) > 0, they correspond to all (or many, anyway) of those words - which means that all bar the first keyword is really superfluous.

What I want to do is take a keyword ("surfboard") and see what his version of rod is actually equal to. Then I take the following keyword and see what it the caulescent version was equal to. And if the two things were equal to the same value of stem, I know at least one of them.

Is it possible to see what a $word evaluating actually in? Or to see if $word1 is the same as $word2 and thus be able to declare word1 word2 is actually?

I already lived this exercise by using things like SOUNDEX and UTL_MATCH. EDIT_DISTANCE_SIMILARITY. I'm NOT interested by these techniques at the moment, that their results are not ideal for what we need to do. I'm focused on just this very specific question: it is possible to compare effectively or otherwise make use of the text Oracle Rod out for a word for similarity comparisons?

In the following example, I added a special character as a printjoin for the lexer and a word starting with this character to the data, because it was the simplest thing I could think that could cause such an error, in order to create an example that would allow me to demonstrate an error management. Note that I've changed a few things, including some which index the lexer is used, and queries and others. The use of the service and management of exceptions should be allowed to operate without errors. However, if you try to do some things differently, so that the value in which search is not only passed to the function, but selected a table within the function then mapped to the parameter, it can cause all of the rows produce an error, that's why I had to change some things around to prevent this.

SCOTT@orcl_11g> BEGIN
  2              CTX_DDL.CREATE_PREFERENCE ('your_lex', 'BASIC_LEXER');
  3              CTX_DDL.SET_ATTRIBUTE ('your_lex', 'INDEX_STEMS', 'ENGLISH');
  4              CTX_DDL.SET_ATTRIBUTE ('your_lex', 'PRINTJOINS', '-');
  5  END;
  6  /

PL/SQL procedure successfully completed.

SCOTT@orcl_11g> CREATE TABLE search_table (mainterm  CLOB)
  2  /

Table created.

SCOTT@orcl_11g> INSERT INTO search_table VALUES
  2  ('asks asking asked approaches analyzes analyzed
  3    allocated activities acccepts accepting accepted
  4    comfortable comes commerce humility huge hr -uh-oh')
  5  /

1 row created.

SCOTT@orcl_11g> create index test_index1 on search_table(mainterm)
  2  indextype is ctxsys.context
  3  PARAMETERS ('LEXER your_lex')
  4  /

Index created.

SCOTT@orcl_11g> create index test_index2 on dr$test_index1$i (token_text)
  2  indextype is ctxsys.context
  3  /

Index created.

SCOTT@orcl_11g> CREATE OR REPLACE FUNCTION get_root
  2    (p_word IN VARCHAR2)
  3    RETURN VARCHAR2
  4  AS
  5    v_word       VARCHAR2 (32767);
  6  BEGIN
  7    SELECT token_text
  8    INTO   v_word
  9    FROM   dr$test_index1$i
 10    WHERE  CONTAINS (token_text, '$' || p_word) > 0
 11    AND    token_type = 9
 12    AND    ROWNUM = 1;
 13    RETURN v_word;
 14  EXCEPTION
 15    WHEN NO_DATA_FOUND THEN RETURN p_word;
 16    WHEN OTHERS THEN RETURN SQLERRM (SQLCODE);
 17  END get_root;
 18  /

Function created.

SCOTT@orcl_11g> SHOW ERRORS
No errors.
SCOTT@orcl_11g> COLUMN keyword      FORMAT A15
SCOTT@orcl_11g> COLUMN root_word FORMAT A61 WORD_WRAPPED
SCOTT@orcl_11g> SELECT DISTINCT token_text AS keyword,
  2           get_root (token_text) AS root_word
  3  FROM   dr$test_index1$i
  4  ORDER  BY keyword, root_word
  5  /

KEYWORD         ROOT_WORD
--------------- -------------------------------------------------------------
-UH-OH          ORA-20000: Oracle Text error:
                DRG-50901: text query parser syntax error on line 1, column 2

ACCCEPTS        ACCCEPTS
ACCEPT          ACCEPT
ACCEPTED        ACCEPT
ACCEPTING       ACCEPT
ACTIVITIES      ACTIVITY
ACTIVITY        ACTIVITY
ALLOCATE        ALLOCATE
ALLOCATED       ALLOCATE
ANALYZE         ANALYZE
ANALYZED        ANALYZE
ANALYZES        ANALYZE
APPROACH        APPROACH
APPROACHES      APPROACH
ASK             ASK
ASKED           ASK
ASKING          ASK
ASKS            ASK
COME            COME
COMES           COME
COMFORTABLE     COMFORTABLE
COMMERCE        COMMERCE
HR              HR
HUGE            HUGE
HUMILITY        HUMILITY

25 rows selected.

SCOTT@orcl_11g>

Tags: Database

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For the first, I get the coefficients of a polynomial function to adapt. I feed the coefficients of the function made the function Eval Poly and get the correct 12.8582 result when I evaluate 49940.

For the second, I create constant array of values that have been returned by the polynomial Fit function (I typed in). However, I get an incorrect result of - 120.7913 when I feed the constant table the function Eval Poly when I evauate 49940.

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A picture of what I explained is attached.

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Please attach a VI instead of an image...

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