Achieving functionality of many preferences using one context index

Question

Hi Gurus,
We have a table of following format
SCOTT@orcl_11gR2> insert all
2 into test_sh values (1, 'Mark Antony')
3 into test_sh values (2, 'Mark-Antony')
4 into test_sh values (3, 'markantony' )
5 into test_sh values (4, 'markantony' )
6 into test_sh values (5, 'Cleopatra' )
7 select * from dual
8 / We need to achieve following functionality in this table
1) fuzzy
2) stem
3) synonym
4) near
5) soundex
6) As mentioned in thread Text Search help using ndata section
7) As mentioned in thread Re: Phrase Serach with special charaters in between using a lexer preference
Please guide me as to how to achieve everything in one shot.
I was thinking to write individual select statement and then do a distinct of id as given below but if we need to achieve #6 and #7 we need to add
a preference and other queries for sundex,stem etc will not work properly. Please guide me how I can achieve all functionality using one index.
> select * from test_sh where id in
select distinct id from (
select id from test_sh where contains (text_nm ,'markantony') > 0
union
select id from test_sh where contains (text_nm ,fuzzy('markantony')) > 0
union
select id from test_sh where contains (text_nm ,fuzzy('!markantony')) > 0
select id from test_sh where contains (text_nm ,fuzzy('$markantony')) > 0
) Thanks & Regards,
Vikas Krishna

Answer 1

I do not get the errror that you get and I get the correct results, as shown below. Please post a copy and paste of a complete test case, run from SQL*Plus, as I have done below.
SCOTT@orcl_11gR2> create table test_sh
  2    (text_id  number,
  3       text      clob)
  4  /
Table created.
SCOTT@orcl_11gR2> insert all
  2  into test_sh values (1, 'Mark Antony')
  3  into test_sh values (2, 'MARK ANTONY')
  4  into test_sh values (3, 'mark antony')
  5  into test_sh values (4, 'MarkAntony')
  6  into test_sh values (5, 'MA RK ANTONY')
  7  into test_sh values (6, 'm a r k antony')
  8  into test_sh values (7, 'Cleopatra' )
  9  select * from dual
10  /
7 rows created.
SCOTT@orcl_11gR2> begin
  2    ctx_ddl.create_preference ('nd_mcds', 'multi_column_datastore');
  3    ctx_ddl.set_attribute ('nd_mcds', 'columns', 'text nd, text text');
  4    ctx_ddl.create_section_group ('nd_sg', 'basic_section_group');
  5    ctx_ddl.add_ndata_section ('nd_sg', 'nd', 'nd');
  6    ctx_ddl.create_preference ('test_lex', 'basic_lexer');
  7    ctx_ddl.set_attribute ('test_lex', 'whitespace', '/\|-_+');
  8  end;
  9  /
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> create index ix_test_sh
  2  on test_sh (text)
  3  indextype is ctxsys.context
  4  parameters
  5    ('datastore  nd_mcds
  6        section    group nd_sg
  7        lexer         test_lex')
  8  /
Index created.
SCOTT@orcl_11gR2> variable search_string varchar2(100)
SCOTT@orcl_11gR2> column text format a30
SCOTT@orcl_11gR2> exec :search_string := 'Mark Antony'
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> select * from test_sh
  2  where  contains
  3             (text,
  4              'ndata (nd,' || :search_string || ') or
  5            syn (?!$' || replace (:search_string, ' ', ';?!$') || ')') > 0
  6  /
   TEXT_ID TEXT
         1 Mark Antony
         2 MARK ANTONY
         3 mark antony
         4 MarkAntony
         5 MA RK ANTONY
         6 m a r k antony
6 rows selected.
SCOTT@orcl_11gR2> exec :search_string := 'MARK ANTONY'
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> /
   TEXT_ID TEXT
         1 Mark Antony
         2 MARK ANTONY
         3 mark antony
         4 MarkAntony
         5 MA RK ANTONY
         6 m a r k antony
6 rows selected.
SCOTT@orcl_11gR2> exec :search_string := 'mark antony'
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> /
   TEXT_ID TEXT
         1 Mark Antony
         2 MARK ANTONY
         3 mark antony
         4 MarkAntony
         5 MA RK ANTONY
         6 m a r k antony
6 rows selected.
SCOTT@orcl_11gR2> exec :search_string := 'MarkAntony'
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> /
   TEXT_ID TEXT
         1 Mark Antony
         2 MARK ANTONY
         3 mark antony
         4 MarkAntony
         5 MA RK ANTONY
         6 m a r k antony
6 rows selected.
SCOTT@orcl_11gR2> exec :search_string := 'MA RK ANTONY'
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> /
   TEXT_ID TEXT
         1 Mark Antony
         2 MARK ANTONY
         3 mark antony
         4 MarkAntony
         5 MA RK ANTONY
         6 m a r k antony
6 rows selected.
SCOTT@orcl_11gR2> exec :search_string := 'm a r k antony'
PL/SQL procedure successfully completed.
SCOTT@orcl_11gR2> /
   TEXT_ID TEXT
         1 Mark Antony
         2 MARK ANTONY
         3 mark antony
         4 MarkAntony
         5 MA RK ANTONY
         6 m a r k antony
6 rows selected.