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Dias Dias - 7 months ago 29
SQL Question

Compare the same column in same table

I need some help solving this problem.
I have the following table (dbo.Users) ordered in a descending way by ID:

ID | UserID | Status | Time |
3 9200 2 2013-05-03
2 9200 1 2013-05-02
1 9200 1 2013-05-01

I want to check if the top two rows have different values for Status column, and if so, I want to get the entire first row.
How can I achieve this?


Assuming by "top two rows" you mean ordered by id descending, then:

select u.*
from (select top 1 u.*
      from dbo.Users u
      order by desc
     ) u
where u.status <> (select top 1 u2.status
                   from dbo.Users u2
                   where <
                   order by desc

The first subquery gets the top row. The second subquery determines whether the status is equal to the status in the second row.