How To Check Null Or '' In Date Field In Expression And ...............

Aug 16, 2006

I have a column say 'ActivationDate' which is a (database timestamp [DT_DBTIMESTAMP]) which I want to replace with an expression in derived columns

The condition is if 'ActivationDate' field is null or '' then 'Null' else 'ActivationDate'

I am struggling to write this condition. Without condition i.e. at present it saves the value in this database '1753-01-01 00:00:00.000'.
In the preview the 'ActivationDate'field does not show any thing so I recon it is either null or ''





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option 1
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Code:


IF ((SELECT Note FROM XATPoDetail WHERE ReqNbr = (SELECT ReqNbr FROM Inserted)) LIKE(''))



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Oct 27, 2004

i have a trigger on a table right now... when fields are inserted, theres a text field inserted and i want to check if that text field = '' (the empty string, not NULL) and if it doesn't equal that, then perform some row updates on other tables, but if it is empty, to not do anything else in the trigger... right now i have this:


IF ((SELECT Note FROM XATPoDetail WHERE ReqNbr = (SELECT ReqNbr FROM Inserted)) LIKE(''))


Note is the text field, XATPoDetail is the table where its being inserted into. I had to do the select FROM the table because it wouldn't let me select a text data type from the "Inserted" virtual table

but it tells me me "Error 279: The text, ntext, and image data types are invalid in this subquery or aggregate expression"

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Hi everyone,

I have two tables - caseinfo and steps.

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Steps shows the steps the case has gone through and the dates of those particular steps.

I need to join the tables to show the steps the case went through during a particular project, but I'm having trouble with the NULL values in the end dates.

If I join the tables so that the step date is between the start and end dates of the project, then I get no step information for the cases where the end date is NULL (that is, where the project hasn't ended yet).

Does anybody have any ideas?

Here are my tables, the query that shows the main idea (with the wrong result), and my expected results.

Thank you for reading.


--- create sample data
set dateformat ymd

declare @caseinfo table (caseid int, startdate smalldatetime, enddate smalldatetime)

insert @caseinfo
select 10, '2006-12-23', '2006-12-27' union all
select 20, '2006-12-23', NULL union all
select 30, '2006-12-23', NULL union all
select 40, '2007-1-15', '2007-3-4'

declare @steps table (caseid int, stepnumber int, stepdate smalldatetime)

insert @steps
select 10, 1, '2006-12-24' union all
select 10, 2, '2007-1-3' union all
select 10, 3, '2007-2-5' union all
select 20, 1, '2006-12-26' union all
select 20, 2, '2007-1-7' union all
select 20, 3, '2007-1-9' union all
select 30, 1, '2007-1-14' union all
select 40, 1, '2007-1-23' union all
select 40, 2, '2007-3-2' union all
select 40, 3, '2007-4-16'

--- the main idea (with the wrong results)

select *
from @caseinfo c
left join @steps s on s.caseid = c.caseid and s.stepdate between c.startdate and c.enddate

--- expected result

declare @expresult table (caseidexp int, startdateexp smalldatetime, enddateexp smalldatetime, stepnumberexp int, stepdateexp smalldatetime)

insert @expresult
select 10, '2006-12-23', '2006-12-27', 1, '2006-12-24' union all
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select 20, '2006-12-23', NULL, 2, '2007-1-7' union all
select 20, '2006-12-23', NULL, 3, '2007-1-9' union all
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select 40, '2007-1-15', '2007-3-4', 1, '2007-1-23' union all
select 40, '2007-1-15', '2007-3-4', 2, '2007-3-2'

select *
from @expresult

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