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if N'ab' = N'aޢb'
select 'hit'
this will print ‘hit’.
i dont know why did sql server thinks these two string are equal.
it seems that ‘�’, or ‘ޢ’ or just empty string, are equal for sql server.
The character you are using is TAI LE LETTER SA which is part of a block in Unicode reserved for annotations. They are decorations and not really text, so they can be treated as invisible by SQL Server.