FILE:
mssql/constraints.sql

ERROR:
The CREATE UNIQUE INDEX statement terminated because a duplicate key was found for the object name 'dbo.yaf_Thanks' and the index name 'IX_yaf_Thanks'. The duplicate key value is ( 297, 98 ).
Could not create constraint. See previous errors.
The statement has been terminated.

STATEMENT:
if not exists(select * from dbo.sysindexes where id=object_id('[dbo].[yaf_Thanks]') and name='IX_yaf_Thanks')
alter table [dbo].[yaf_Thanks] add constraint IX_yaf_Thanks unique nonclustered([ThanksFromUserID],[ThanksToUserID])