How to give more relevance to one of the column in multi-column data store
Hi gurus,When using multi-column datastore necessary to give more importance to one of the other column. How can we achieve the same?
SQL > create table test_sh4 (text1, text2 clob clob);Here, while querying how can I give more relevant for the text1 Text2 column as column?
Table created.
SQL > alter table test_sh4 Add (Text3 clob);
Modified table.
SQL > start
2 ctx_ddl.create_preference ('nd_mcd', 'multi_column_datastore');
3 ctx_ddl.set_attribute
4 ("nd_mcd",
5 "columns."
6 ' replace (Text1, "", "") nd, Text1 text1, replace (Text1, "", "') nd, Text1 text1');
7 ctx_ddl.set_attribute ('nd_mcd', 'separator', 'new line');
8 ctx_ddl.create_preference ('test_lex1', 'basic_lexer');
9 ctx_ddl.set_attribute ('test_lex1', 'spaces', ' /--------|-_ + "");
10 end;
11.
PL/SQL procedure successfully completed.
SQL > create index IX_test_sh4 on test_sh4 (Text3)
indexType is ctxsys.context
parameters
("nd_mcd of the data store
lexer test_lex1')
/ 2 3 4 5 6
Index created.
I gave an example below. I added some data to your example. You had tags and columns duplicated in your multi_column_datastore, so I fixed it those. I removed the newline delimiter and added a section with sections of field group and add this section to the index settings group. Allows you to search in each section of field and apply different fats. You can apply weights by multiplying by a value entre.1 and 10 or several times multiplier to reduce or increase the score for a particular section.
SCOTT@orcl_11gR2> -- table structure you provided:
SCOTT@orcl_11gR2> create table test_sh4 (text1 clob,text2 clob);
Table created.
SCOTT@orcl_11gR2> alter table test_sh4 add (text3 clob);
Table altered.
SCOTT@orcl_11gR2> -- added data:
SCOTT@orcl_11gR2> insert all
2 into test_sh4 (text1, text2, text3)
3 values ('testword', 'word2', 'word3')
4 into test_sh4 (text1, text2, text3)
5 values ('word4', 'testword', 'word5')
6 into test_sh4 (text1, text2, text3)
7 values ('test word', 'word2', 'word3')
8 into test_sh4 (text1, text2, text3)
9 values ('word4', 'test word', 'word5')
10 select * from dual
11 /
4 rows created.
SCOTT@orcl_11gR2> -- fixed duplicate column names and tags and
SCOTT@orcl_11gR2> -- removed newline delimiter and
SCOTT@orcl_11gR2> -- added section group with field sections:
SCOTT@orcl_11gR2> begin
2 ctx_ddl.create_preference ('nd_mcd', 'multi_column_datastore');
3 ctx_ddl.set_attribute
4 ('nd_mcd',
5 'columns',
6 'replace (text1, '' '', '''') nd1,
7 text1 text1,
8 replace (text2, '' '', '''') nd2,
9 text2 text2');
10 ctx_ddl.create_preference ('test_lex1', 'basic_lexer');
11 ctx_ddl.set_attribute ('test_lex1', 'whitespace', '/\|-_+');
12 ctx_ddl.create_section_group ('test_sg', 'basic_section_group');
13 ctx_ddl.add_field_section ('test_sg', 'text1', 'text1', true);
14 ctx_ddl.add_field_section ('test_sg', 'nd1', 'nd1', true);
15 ctx_ddl.add_field_section ('test_sg', 'text2', 'text2', true);
16 ctx_ddl.add_field_section ('test_sg', 'nd2', 'nd2', true);
17 end;
18 /
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> -- added section group to index:
SCOTT@orcl_11gR2> create index IX_test_sh4 on test_sh4 (text3)
2 indextype is ctxsys.context
3 parameters
4 ('datastore nd_mcd
5 lexer test_lex1
6 section group test_sg')
7 /
Index created.
SCOTT@orcl_11gR2> column text1 format a10
SCOTT@orcl_11gR2> column text2 format a10
SCOTT@orcl_11gR2> column text3 format a10
SCOTT@orcl_11gR2> -- without weighting:
SCOTT@orcl_11gR2> select score (1), t.* from test_sh4 t
2 where contains
3 (t.text3,
4 'testword',
5 1) > 0
6 /
SCORE(1) TEXT1 TEXT2 TEXT3
---------- ---------- ---------- ----------
6 testword word2 word3
6 word4 testword word5
3 test word word2 word3
3 word4 test word word5
4 rows selected.
SCOTT@orcl_11gR2> -- with weighting:
SCOTT@orcl_11gR2> select score (1), t.* from test_sh4 t
2 where contains
3 (t.text3,
4 '(testword within text1) * 10 or
5 (testword within nd1) * 5 or
6 (testword within text2) * .5 or
7 (testword within nd2) * .1',
8 1) > 0
9 order by score (1) desc
10 /
SCORE(1) TEXT1 TEXT2 TEXT3
---------- ---------- ---------- ----------
48 testword word2 word3
20 test word word2 word3
2 word4 testword word5
1 word4 test word word5
4 rows selected.
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