Update Date types based on actions

Question

Hi Gurus,
I have a requirement to update date types within a date profile based on a certain action condition.
I have 3 date types:
Downtime Start
Downtime End
Total Downtime Duration
The priorities in my transaction have, x, y, z for example and x is default.
Upon selecting y, the system should take into consideration the timestamp of this change and update the Downtime Start... The moment the priority is changed to anything other than "y", it should take this timestamp and update "downtime end".
The difference between these two times would be the third date type.
Any ideas how to proceed?
Regards,
Ash

Answer 1

Hi
Please post DDL+DML next time :-)
-- This is the DDL! create the database structure
create table DateRange(
StartDate DATE,
FinishDate DATE,
Condition BIT
GO
create table Calendar(
CalendarDate DATE,
IsParental BIT
GO
-- This is the DML (insert some sample data)
insert DateRange
values
('2014-01-02', '2014-01-03', 1),
('2014-01-03', '2014-01-13', 0),
('2014-01-13', '2014-01-14', 1)
GO
insert Calendar(CalendarDate)
values
('2014-01-01'),
('2014-01-02'),
('2014-01-03'),
('2014-01-04'),
('2014-01-05'),
('2014-01-06'),
('2014-01-07'),
('2014-01-08'),
('2014-01-09'),
('2014-01-10')
select * from DateRange
select * from Calendar
GO
-- This is the solution
select CalendarDate
from Calendar C
where EXISTS (
select C.CalendarDate
FROM DateRange D
where C.CalendarDate between D.StartDate and D.FinishDate and D.Condition = 1
UPDATE Calendar
SET IsParental = 1
from Calendar C
where EXISTS (
select C.CalendarDate
FROM DateRange D
where C.CalendarDate between D.StartDate and D.FinishDate and D.Condition = 1
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