Question

I have a SQL query that I cant wrap my mind around. I do not have a large amount of sql experience. So I need some help

I have a table XXX:

Social Security No (SSN).
Name.
organisation. (Finance/IT)

In english what I want is:

To select all SSNs and Names in “Finance” where there is a different name for that SSN in “IT”.

My not working attempt:

select ssn , name from XXX where org = “Finance” and name not in (select name from XXX where org=”IT” and ssn=the_first_ssn)

Please help.

---

I have decided to make it a bit more difficult.

SSN can ocur multiple times in “IT”:

So I want to select all SSNs and Names in Finance where the SSN does not exist with the same Name in “IT”

Answer 1

You could use a subquery in an exists clause:

select  ssn, name
from    YourTable a
where   organisation = 'Finance'
        and exists
        (
        select  *
        from    YourTable b
        where   organisation = 'IT'
                and a.ssn = b.ssn
                and a.name <> b.name
        )

The subquery says there must be a row in IT with the same SSN but a different name.