Multiple MACTHES with OR gives error

Question

Hi,
i'm new to oracle database.
I have problem with matches when i use OR but with AND it works fine.
SELECT DISTINCT members.email , authors.IDq
FROM authors, titles, members, queries
WHERE (queries.type = 'AND' AND queries.IDq = authors.IDq AND queries.IDq = titles.IDq AND queries.IDm = members.IDm )
AND ( (MATCHES(title_query,'Multiobjective Evolutionary Optimization of Greenhouse Vegetable Crop Distributions.')>0)
OR (MATCHES(author_query,'Francisco G. Montoya')>0));
ERROR at line 1:
ORA-20000: Oracle Text error:
DRG-10868: matches does not support functional invocation
I read the forum and think that i have to use SECTIONS GROUP is it going to work with SECTIONS ?
Also i can't understand how can i use SECTIONS GROUP because i have 2 INDEX then obviously i will have to go with 1 index .
All the creation of database is below
CREATE TABLE members (
     IDm          INT PRIMARY KEY,
     username          varchar2(80),
     email          varchar2(120),
     fullname     varchar2(120),
     password     varchar2(150)
CREATE TABLE queries (
     IDq          INT PRIMARY KEY,
     IDm          INT,
     type     varchar2(10),
     query_string     VARCHAR2(500)
CREATE TABLE authors (
     IDa          INT PRIMARY KEY,
     IDq          INT,
     author_query     varchar2(250)
CREATE INDEX authorsx ON authors(author_query) INDEXTYPE IS CTXSYS.CTXRULE;
CREATE TABLE titles (
     IDt          INT PRIMARY KEY,
     IDq          INT,
     title_query     varchar2(250)
CREATE INDEX titlesx ON titles(title_query) INDEXTYPE IS CTXSYS.CTXRULE;
CREATE SEQUENCE members_seq
START WITH 1
INCREMENT BY 1
NOCACHE
NOCYCLE
NOMAXVALUE;
CREATE SEQUENCE queries_seq
START WITH 1
INCREMENT BY 1
NOCACHE
NOCYCLE
NOMAXVALUE;
CREATE SEQUENCE authors_seq
START WITH 1
INCREMENT BY 1
NOCACHE
NOCYCLE
NOMAXVALUE;
CREATE SEQUENCE titles_seq
START WITH 1
INCREMENT BY 1
NOCACHE
NOCYCLE
NOMAXVALUE;
thanks you for your time.

Answer 1

Hi,
welcome to the forums.
The problem with this error is not because of the index, but the Oracle Optimizer. It tries sometimes functional invocation. A rewrite of the query can help to split the OR (through an union):
SELECT DISTINCT members.email , authors.IDq
from
  select members.email, authors.idq
  FROM authors, titles, members, queries
  WHERE (queries.type = 'AND' AND queries.IDq = authors.IDq AND queries.IDq = titles.IDq AND queries.IDm = members.IDm )
  AND MATCHES(title_query,'Multiobjective Evolutionary Optimization of Greenhouse Vegetable Crop Distributions.')>0
  union all
  select members.email, authors.idq
  FROM authors, titles, members, queries
  WHERE (queries.type = 'AND' AND queries.IDq = authors.IDq AND queries.IDq = titles.IDq AND queries.IDm = members.IDm )
  AND MATCHES(author_query,'Francisco G. Montoya')>0
)Another option is to use Inline Views or Subquery Factoring (use of With in a select), but the above is the easiest to understand.
Try it and see if that works.
Herald ten Dam
http://htendam.wordpress.com