Question : query to get previous field (similar to crystal 'Previous (fld)' or 'Next(fld)' )

Hi experts,

I have this two tables that I need to Join and I need to get Next field in the next record. Next field is based on the Date field of the following record.
Here are my tables and the result I need.

Table1:
ResID    Class    
ALTJ       80      

Table2:
ResID       Date         Room    
ALTJ      3/4/2005     StudioA
ALTJ      7/3/2005     StudioC

I need to get:
TableResult:
ResID        Class         Date          Room      NextDateFld
ALTJ           80         3/4/2005     StudioA       7/3/2005
ALTJ           80         7/3/2005     StudioC        

The last NextDateFld is NULL because there is no next date for that ResID (no other record)

Thanks for any suggestions
cm

Answer : query to get previous field (similar to crystal 'Previous (fld)' or 'Next(fld)' )

Since the NextDateFld is a derived column, you cannot include that in the WHERE clause.  One thing you can do is the following:

SELECT * FROM (
SELECT DISTINCT A.ResID, A.Class, B.Date, B.Room,
            ISNULL((SELECT MIN(Date) FROM Table2 C WHERE A.ResID = C.ResID AND
                        C.Date > B.Date), A.LastDate) AS NextDateFld
FROM Table1 A INNER JOIN Table2 B
    ON A.ResID = B.ResID) A
WHERE NextDateFld != '01/01/2000'