Question

I am trying to get the average and last date row from a table that has duplications of rows for the same ID, for example:

Table:
ID  VisitID     Date            Value
1   1       10-10-2001      1
2   1       10-11-2001      1
1   2       10-11-2001      3
OUT PUT
Table:
ID  VisitID     Date                Value
1   1       10-11-2001 ***(max date)***     2  (***total of the two date / number of rows)***
2   1       10-11-2001          1

Thanks in advance.

Answer 1

SELECT ID 
,VisitID = MIN(VisitID)
,Date = MAX(Date)
,Value= COUNT(*)
FROM Table
GROUP BY ID

is what I think you want, unless I’m missing the question.