Question

I have a table as below

ID   Date  
1    Null  
1    Null  
1    Null  
1    02/02/2012  
1    02/03/2012  
1    02/04/2012  
1    02/05/2012  

I want to take a min date from the above table, that’s result should be Null

I was trying to write

select min(date), Id from Table group by ID

then result is 02/02/2012, but I want Null.

Is there any otherway to pull Null value from the above table except the below method?

select top 1 date, ID from table order by date asc

Answer 1

By default the functions MAX and MIN do not count NULL in their evaluation of your data.

Try in this way, should do the trick :

SELECT 
CASE WHEN MIN(COALESCE(Date, '19001231')) = '19001231' THEN NULL ELSE MIN(Date) END AS Date,
Id 
FROM X 
group by ID