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How to use multiple conditions using when then?
Posted on 2011-03-23
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.
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.
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5 Comments
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'
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'
Active today
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.
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.
@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
Somehow it won't change the value when I add an extra condition. :-S
Active today
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.
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.
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