Single-column index a must???

[Abhi2000]

Hello,

I have a query about full-text search feature of MS SQL
Server 2000. According to MSDN - "The principal design
requirement for full-text indexing, querying, and
synchronization is the presence of a full-text unique key
column (or single-column primary key) on all tables that
are registered for full-text search".
Now my question is -

1) What is this index needed for?

2) In my database design, the table I want to create full-
text index on has a composite primary key spanning 3
columns. How can I do full-text search on a text field in
this table? I cannot change the database design now to create a single column primary key.

Thanks in advance,
- Abhi.

 

[rac2]

Don't know anything about full-text search function, but
I know that

a UNIQUE constraint is not the same thing as a PRIMARY KEY constraint. A table can have only one PRIMARY KEY, but it can have several UNIQUE constraints. A UNIQUE CONSTRAINT can be defined for one column or for a combination of columns.

Also I think that an index is automatically created for a UNIQUE constraint, and that would be very helpful when searching.