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Developer-C 11.1
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declare @t table(personid int, first_name varchar(50), last_name varchar(50), ssn int) insert into @t values(1, 'Roman', 'Smith', 12), (2, 'John', 'Thomas', 15), (3, 'John', 'Thomas', 15) select personid, first_name, last_name, ssn from (select *, count(*) over(partition by first_name, last_name, ssn) as freq from @t) a where freq=1;
personid
first_name
last_name
ssn
1
Roman
Smith
12