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create table xxx (keynumber nvarchar(10) primary key clustered, comment nvarchar(20))
insert into xxx (keynumber,comment) values ('12345','First Comment'), ('''12345','Second Comment'), ('12346','Third Comment'), ('''12346','Fourth Comment'), ('123457','Fith Comment')
5 rows affected
SELECT x1.keynumber, x2.keynumber FROM xxx as x1 JOIN xxx as x2 ON '''' + x1.keynumber = x2.keynumber
keynumber
keynumber
12345
'12345
12346
'12346