[Okta Webinar] Learn how to a build a cloud-first strategyRegister Now

x
?
Solved

How to use multiple conditions using when then?

Posted on 2011-03-23
5
Medium Priority
?
606 Views
Last Modified: 2012-05-11
I am trying to update a field.
The field should be updated only if the current month is x and field_04 contains value y.
When I use a single condition the field gets updated just fine.
but I can't seem to get it to function when I add another condition.

This works:

update Items
set Field_04 = case
      when  DATEPART(mm,getdate()) = 1 and Field_04<'3500' then '3500'
      when  DATEPART(mm,getdate()) = 2 and Field_04<'4500' then '4500'
       end
from Items
where DATEPART(mm,getdate()) IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) and Condition='A'


This doesn't work:

update Items
set Field_04 = case
      when  DATEPART(mm,getdate()) = 1 then '3500'
      when  DATEPART(mm,getdate()) = 2 then '4500'
       end
from Items
where DATEPART(mm,getdate()) IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) and Condition='A'


I guess it has something to do with the when then statement.
Maybe it cannot contain multiple conditions or maybe I'm just using the wrong syntax?

Thanks in advance!
Clyde.
0
Comment
Question by:Clyde_Radcliffe
  • 2
  • 2
5 Comments
 
LVL 26

Expert Comment

by:tigin44
ID: 35197465
try this

update Items
set Field_04 = case
      when  MONTH(getdate()) = 1 then '3500'
      when  MONTH(getdate()) = 2 then '4500'
       end
from Items
where MONTH(getdate()) IN (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
  and Condition='A'
0
 
LVL 71

Expert Comment

by:Qlemo
ID: 35197471
You have mixed up the not working and the working solution.
No, I don't see why that should not work. You can concat conditions in the WHEN clause, as you did.
But your where condition does not make much sense - the datepart of month  will always be in the range of 1 to 12, so that whole part is superfluous.
0
 

Author Comment

by:Clyde_Radcliffe
ID: 35197491
@Qlemo: I have spend way to many hours after the screen. Sorry for the mixup! :-)
Somehow it won't change the value when I add an extra condition. :-S
0
 
LVL 71

Accepted Solution

by:
Qlemo earned 2000 total points
ID: 35197521
Is Field_04 really varchar? You should always check with a control SELECT first, containing some identifying column, the columns you check for, and the expression you need to generate:

select field_04, date_part(mm, getdate()), case
      when  DATEPART(mm,getdate()) = 1 and Field_04<'3500' then '3500'
      when  DATEPART(mm,getdate()) = 2 and Field_04<'4500' then '4500'
      else field_04
       end as expr
from items where Condition = 'A'

Further you should always provide an else - else the result is NULL if no condition is met.
0
 

Author Comment

by:Clyde_Radcliffe
ID: 35198393
@Qlemo: Thanks! I didn't realize that I should use the ELSE.
Everything works like a charm now!
0

Featured Post

NEW Veeam Backup for Microsoft Office 365 1.5

With Office 365, it’s your data and your responsibility to protect it. NEW Veeam Backup for Microsoft Office 365 eliminates the risk of losing access to your Office 365 data.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

It is possible to export the data of a SQL Table in SSMS and generate INSERT statements. It's neatly tucked away in the generate scripts option of a database.
This shares a stored procedure to retrieve permissions for a given user on the current database or across all databases on a server.
Via a live example, show how to extract information from SQL Server on Database, Connection and Server properties
Via a live example, show how to shrink a transaction log file down to a reasonable size.
Suggested Courses

872 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question