Question

I added a new column to a table. The columns of the table are:

Identifier(unique identity but not joinable to the other table)
ClinicalID(int)
senttime(datetime)
orgID(int-new column)

I need to update the new column from a different table based on the sent time.
I should check on what date range the sent time falls and update the orgID accordingly.
Columns of the other table:

ClinicalIDentifier
org ID(int) 
old orgID(int)
effectivefromtime
effectivethrutime

The issue I am facing is that if the senttime is > effective fromtime of the other table, it displayes the other org IDs of the same ClinicalID where the senttime is > effective fromtime.

I am stuck at comparing date ranges.

Please let me know if you require any further information

Answer 1

Got it!!

select  
case when (effectivethrutime is null and senttime >= effectivefromtime) then orgid  
when (effectivethrutime is not null and senttime >= effectivefromtime) then orgID  
when (effectivethrutime is not null and senttime between effectivethrutime and   effectivefromtime) then orgid  
end as orgid  
from ac  
left join op  
on ac.clinicalidentifier=op.clinicalidentifier  
where ac.senttime>op.effectivefromtime   
and ac.senttime<=isnull(op.effectivethrutime,ac.senttime)

This works as of now.
Let me know if I need to make any corrections.
Thanks
vihar