Question

I have this table in sql server 2005:

id   student active
1   Bob     1
3   Rob     0
5   Steve   1
7   John    1
8   Mark    0
10   Dave    0
16   Nick    1

My select query returns an active student by a given id.
But I also want to return the ids of prev and next student who are active. If no prev, it will be 0 or null. Same for next.

Example: for id=5, my select would return

id    student    prev_id    next_id
5     steve       1          7

Example: for id=7, my select would return

id    student    prev_id    next_id
7     John       5          16

Example: for id=16, my select would return

id    student    prev_id    next_id
16    Nick       7          0

How do I write this select query?

I have query but I just can’t get the prev id correctly. It always returns the first active id.

Thanks

EDIT:
Here is the query I have right now.

select id, student, 
(select top 1 id from test where id<7 and active=1) as prev,
(select top 1 id from test where id>7 and active=1) as next 
from test where id=7--I used 7 just as an example. it will be a parameter

Answer 1

try something like this

SELECT  ID,
        Student,
        ( SELECT TOP 1
                    ID
          FROM      dbo.table AS pT
          WHERE     pT.ID < T.ID And Active = 1
          ORDER BY  ID DESC
        ) AS PrevID,
        ( SELECT TOP 1
                    ID
          FROM      dbo.table AS pT
          WHERE     pT.ID > T.ID And Active = 1
          ORDER BY  ID
        ) AS NextID
FROM    dbo.table AS T