The following bug has been logged online:

Bug reference:      1860
Logged by:          Viswanath Ramineni
Email address:      [EMAIL PROTECTED]
PostgreSQL version: 8.1 Beta
Operating system:   Windows 2000 Professional
Description:        Insert failed due to unique index
Details: 

I have a table with a primary key on id (integer) column and a unique index
on varchar(10) column. Insertion fails when the value of the unique column
is substring of an existing value. For example, if I have a row with the
unique column value 'TEST1', it will not allow me insert another row with
'TEST' as the value for this column.

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