SQL Query to find out similar names in two tables

Question

Hi,
I want to write a query which will return the records by matching the two table with the similar name.
that is I have two tables table1 and table2, and in table1 the column1 is having data like
ABC INC
The international Company
and in the table2 has the column1 which has the data like
ABC Corp
The Financials Corporation
So as per the requirement now my select query should return 1 row as ABC INC and ABC Corp are similer.
and both the tables have around 50,000 reords so I cannot just take the first word by using substring and tryto match both, this will work only for names like ABC INC and ABC Corp but it will not return the names like
"Instruments International Company" and "International Instruments Company"
Please can any one help me?
Regards,
Chanda

Answer 1

I don't have access to text here so I can't check.Almost. Better to use OR than AND:
SQL> CREATE TABLE t (ID INTEGER, text VARCHAR2(2000))
  2  /
Table created.
SQL> INSERT INTO t
  2       VALUES (1, 'The international Company')
  3  /
1 row created.
SQL> INSERT INTO t
  2       VALUES (2, 'ABC INC')
  3  /
1 row created.
SQL> CREATE INDEX t_txt_idx ON t
  2  (text)
  3  INDEXTYPE IS ctxsys.CONTEXT
  4  /
Index created.
SQL> SELECT *
  2    FROM t
  3   WHERE contains (text,
  4                   REPLACE ('International Instruments Company', ' ', ' & ')
  5                  ) > 0
  6  /
no rows selected
SQL> SELECT *
  2    FROM t
  3   WHERE contains (text,
  4                   REPLACE ('International Instruments Company', ' ', ' | ')
  5                  ) > 0
  6  /
ID TEXT
  1 The international Company
BUT than also :(
SQL> SELECT *
  2    FROM t
  3   WHERE contains (text,
  4                   REPLACE ('Company Instruments', ' ', ' | ')
  5                  ) > 0
  6  /
ID TEXT
  1 The international Company