equal distribution of start and finish dates

Question. What exactly is your expected result? It's not entirely clear
from your description. I think you're saying that for December 2000 the
cost should be $2,000. For the other, it soundes like you are looking to
pro-rate the $400? If so, across what time period do you want it pro-rated
exactly?
"mita" <mita@.discussions.microsoft.com> wrote in message
news:D24E0F04-CD11-4C6E-AB9D-6B23384F5964@.microsoft.com...
> Hi all
> I have got 3 columns in my table- start date,finish date and cost..in the
> following format...
> start_date finish_date cost
> 12/12/2000 20/12/2000 $2000
> 01/09/2000 12/10/2000 $400
> Now if the month and year of the start and finish date is same, the cost
> remains same...
> but if the month of the two dates are different, i have to distribute the
> cost between the two months by calculating the cost for the number of days
> for both of the months..
> but i am not able to figure out how?
> i am using sql 2005 ..
> my table has got about 1 million rows...
> pls helpHi all
I have got 3 columns in my table- start date,finish date and cost..in the
following format...
start_date finish_date cost
12/12/2000 20/12/2000 $2000
01/09/2000 12/10/2000 $400
Now if the month and year of the start and finish date is same, the cost
remains same...
but if the month of the two dates are different, i have to distribute the
cost between the two months by calculating the cost for the number of days
for both of the months..
but i am not able to figure out how?
i am using sql 2005 ..
my table has got about 1 million rows...
pls help|||Question. What exactly is your expected result? It's not entirely clear
from your description. I think you're saying that for December 2000 the
cost should be $2,000. For the other, it soundes like you are looking to
pro-rate the $400? If so, across what time period do you want it pro-rated
exactly?
"mita" <mita@.discussions.microsoft.com> wrote in message
news:D24E0F04-CD11-4C6E-AB9D-6B23384F5964@.microsoft.com...
> Hi all
> I have got 3 columns in my table- start date,finish date and cost..in the
> following format...
> start_date finish_date cost
> 12/12/2000 20/12/2000 $2000
> 01/09/2000 12/10/2000 $400
> Now if the month and year of the start and finish date is same, the cost
> remains same...
> but if the month of the two dates are different, i have to distribute the
> cost between the two months by calculating the cost for the number of days
> for both of the months..
> but i am not able to figure out how?
> i am using sql 2005 ..
> my table has got about 1 million rows...
> pls help|||mita
USE My_Test1
CREATE TABLE dbo.Test
(
start_date DATETIME NOT NULL,
finish_date DATETIME NOT NULL,
cost DECIMAL(18,3)
)
INSERT INTO dbo.Test VALUES ('20001212','20001220',2000)
INSERT INTO dbo.Test VALUES ('20000901','20001012',400)
INSERT INTO dbo.Test VALUES ('20000901','20001212',300)
WITH mytest (start_date,finish_date,cost,Diff_Days)
AS
(
SELECT start_date,finish_date,cost,
DATEDIFF(month, start_date,finish_date) AS Diff_Days
FROM dbo.Test
)
SELECT CASE WHEN Diff_Days =0 THEN cost ELSE cost*Diff_Days END
FROM mytest
"mita" <mita@.discussions.microsoft.com> wrote in message
news:D24E0F04-CD11-4C6E-AB9D-6B23384F5964@.microsoft.com...
> Hi all
> I have got 3 columns in my table- start date,finish date and cost..in the
> following format...
> start_date finish_date cost
> 12/12/2000 20/12/2000 $2000
> 01/09/2000 12/10/2000 $400
> Now if the month and year of the start and finish date is same, the cost
> remains same...
> but if the month of the two dates are different, i have to distribute the
> cost between the two months by calculating the cost for the number of days
> for both of the months..
> but i am not able to figure out how?
> i am using sql 2005 ..
> my table has got about 1 million rows...
> pls help|||mita
USE My_Test1
CREATE TABLE dbo.Test
(
start_date DATETIME NOT NULL,
finish_date DATETIME NOT NULL,
cost DECIMAL(18,3)
)
INSERT INTO dbo.Test VALUES ('20001212','20001220',2000)
INSERT INTO dbo.Test VALUES ('20000901','20001012',400)
INSERT INTO dbo.Test VALUES ('20000901','20001212',300)
WITH mytest (start_date,finish_date,cost,Diff_Days)
AS
(
SELECT start_date,finish_date,cost,
DATEDIFF(month, start_date,finish_date) AS Diff_Days
FROM dbo.Test
)
SELECT CASE WHEN Diff_Days =0 THEN cost ELSE cost*Diff_Days END
FROM mytest
"mita" <mita@.discussions.microsoft.com> wrote in message
news:D24E0F04-CD11-4C6E-AB9D-6B23384F5964@.microsoft.com...
> Hi all
> I have got 3 columns in my table- start date,finish date and cost..in the
> following format...
> start_date finish_date cost
> 12/12/2000 20/12/2000 $2000
> 01/09/2000 12/10/2000 $400
> Now if the month and year of the start and finish date is same, the cost
> remains same...
> but if the month of the two dates are different, i have to distribute the
> cost between the two months by calculating the cost for the number of days
> for both of the months..
> but i am not able to figure out how?
> i am using sql 2005 ..
> my table has got about 1 million rows...
> pls help|||mita wrote:
> Hi all
> I have got 3 columns in my table- start date,finish date and cost..in the
> following format...
> start_date finish_date cost
> 12/12/2000 20/12/2000 $2000
> 01/09/2000 12/10/2000 $400
> Now if the month and year of the start and finish date is same, the cost
> remains same...
> but if the month of the two dates are different, i have to distribute the
> cost between the two months by calculating the cost for the number of days
> for both of the months..
> but i am not able to figure out how?
> i am using sql 2005 ..
> my table has got about 1 million rows...
> pls help
This will handle a two-month period, anything more than that is going to
be more complicated:
USE tempdb
GO
CREATE TABLE dbo.Test (
start_date DATETIME NOT NULL,
finish_date DATETIME NOT NULL,
cost DECIMAL(18,3)
)
INSERT INTO dbo.Test VALUES ('20001212','20001220',2000)
INSERT INTO dbo.Test VALUES ('20000901','20001012',400)
INSERT INTO dbo.Test VALUES ('20000901','20001212',300)
GO
CREATE FUNCTION dbo.DaysInMonth(@.Date DATETIME)
RETURNS INT
AS
BEGIN
RETURN (DATEPART(day, CONVERT(DATETIME, RTRIM(CONVERT(CHAR(2),
DATEPART(month, @.Date) + CASE WHEN DATEPART(month, @.Date) = 12 THEN -11
ELSE 1 END)) + '/1/' + CONVERT(CHAR(4), DATEPART(year, @.Date))) - 1))
END
GO
SELECT
start_date,
finish_date,
cost,
CASE WHEN DATEPART(month, start_date) = DATEPART(month, finish_date)
THEN cost ELSE cost * (dbo.DaysInMonth(start_date) - DATEPART(day,
start_date)) / CONVERT(NUMERIC, DATEDIFF(day, start_date, finish_date),
4) END AS portion1,
CASE WHEN DATEPART(month, start_date) = DATEPART(month, finish_date)
THEN 0 ELSE cost - (cost * (dbo.DaysInMonth(start_date) - DATEPART(day,
start_date)) / CONVERT(NUMERIC, DATEDIFF(day, start_date, finish_date),
4)) END AS portion2
FROM dbo.Test|||HI Mike u r right..i need to prorate $400 according to the no. of days...for
ex cost for 30 days of september and 12 days for october
"Mike C#" wrote:

> Question. What exactly is your expected result? It's not entirely clear
> from your description. I think you're saying that for December 2000 the
> cost should be $2,000. For the other, it soundes like you are looking to
> pro-rate the $400? If so, across what time period do you want it pro-rate
d
> exactly?
> "mita" <mita@.discussions.microsoft.com> wrote in message
> news:D24E0F04-CD11-4C6E-AB9D-6B23384F5964@.microsoft.com...
>
>|||On Sat, 17 Jun 2006 17:35:02 -0700, mita wrote:

>Hi all
>I have got 3 columns in my table- start date,finish date and cost..in the
>following format...
>start_date finish_date cost
>12/12/2000 20/12/2000 $2000
>01/09/2000 12/10/2000 $400
>Now if the month and year of the start and finish date is same, the cost
>remains same...
>but if the month of the two dates are different, i have to distribute the
>cost between the two months by calculating the cost for the number of days
>for both of the months..
>but i am not able to figure out how?
>i am using sql 2005 ..
>my table has got about 1 million rows...
>pls help
Hi mita,
First, you need to create a table that holds all months in your
reporting period (or more). Something like this:
CREATE TABLE dbo.Months
(MonthStart datetime NOT NULL PRIMARY KEY,
MonthEnd datetime NOT NULL);
go
DECLARE @.TheMonth datetime;
SET @.TheMonth = '200000101'; -- Start at january 2000
WHILE @.TheMonth <= '20191231' -- End at december 2019
BEGIN;
INSERT INTO dbo.Months (MonthStart, MonthEnd)
VALUES (@.TheMonth, DATEADD(day, -1, DATEADD(month, 1, @.TheMonth)));
SET @.TheMonth = DATEADD(month, 1, @.TheMonth);
END;
The above is a one time operation, provided you never drop the table.
Don't forget to add some extra months to the table in a year or ten!
With this table in place, your query becomes something like this:
SELECT PeriodStart, PeriodEnd,
TotalCost * DATEDIFF (day, PeriodStart, PeriodEnd)
/ DATEDIFF (day, start_date, finish_date) AS cost
FROM (SELECT CASE WHEN a.start_date > b.MonthStart
THEN a.start_date
ELSE b.MonthStart
END AS PeriodStart,
CASE WHEN a.finish_date < b.MonthEnd
THEN a.finish_date
ELSE b.MonthEnd
END AS PeriodEnd,
a.start_date, a.finish_date,
a.cost AS TotalCost
FROM dbo.MyTable AS a
INNER JOIN dbo.Months AS b
ON b.MonthStart <= a.finish_date
AND b.MonthStart >= a.start_date) AS d
(Untested - see www.aspfaq.com/5006 if you prefer a tested reply)
Hugo Kornelis, SQL Server MVP|||hi hugo
i just ran this query for creating the months table which u suggested... i
am getting an error....
"Conversion failed when converting datetime from character string." what do
i do?
"Tracy McKibben" wrote:

> mita wrote:
> This will handle a two-month period, anything more than that is going to
> be more complicated:
> USE tempdb
> GO
> CREATE TABLE dbo.Test (
> start_date DATETIME NOT NULL,
> finish_date DATETIME NOT NULL,
> cost DECIMAL(18,3)
> )
> INSERT INTO dbo.Test VALUES ('20001212','20001220',2000)
> INSERT INTO dbo.Test VALUES ('20000901','20001012',400)
> INSERT INTO dbo.Test VALUES ('20000901','20001212',300)
> GO
> CREATE FUNCTION dbo.DaysInMonth(@.Date DATETIME)
> RETURNS INT
> AS
> BEGIN
> RETURN (DATEPART(day, CONVERT(DATETIME, RTRIM(CONVERT(CHAR(2),
> DATEPART(month, @.Date) + CASE WHEN DATEPART(month, @.Date) = 12 THEN -11
> ELSE 1 END)) + '/1/' + CONVERT(CHAR(4), DATEPART(year, @.Date))) - 1))
> END
> GO
> SELECT
> start_date,
> finish_date,
> cost,
> CASE WHEN DATEPART(month, start_date) = DATEPART(month, finish_date)
> THEN cost ELSE cost * (dbo.DaysInMonth(start_date) - DATEPART(day,
> start_date)) / CONVERT(NUMERIC, DATEDIFF(day, start_date, finish_date),
> 4) END AS portion1,
> CASE WHEN DATEPART(month, start_date) = DATEPART(month, finish_date)
> THEN 0 ELSE cost - (cost * (dbo.DaysInMonth(start_date) - DATEPART(day,
> start_date)) / CONVERT(NUMERIC, DATEDIFF(day, start_date, finish_date),
> 4)) END AS portion2
> FROM dbo.Test
>|||HI Mike u r right..i need to prorate $400 according to the no. of days...for
ex cost for 30 days of september and 12 days for october
"Mike C#" wrote:

> Question. What exactly is your expected result? It's not entirely clear
> from your description. I think you're saying that for December 2000 the
> cost should be $2,000. For the other, it soundes like you are looking to
> pro-rate the $400? If so, across what time period do you want it pro-rate
d
> exactly?
> "mita" <mita@.discussions.microsoft.com> wrote in message
> news:D24E0F04-CD11-4C6E-AB9D-6B23384F5964@.microsoft.com...
>
>