#### Calculate difference in rows in a query

```I have a query that calculates how much revenue is claimed by month per job
but then I have to take the new month less the prior month.  The problem is
the data is in row format.  I don't know how to subtract February from
January, March from but don't know how. I know how to do it in Excel but not

Example:
Order	Month	JTD Clm	Variance
101026521	January	\$511,525 	\$0
101026521	February	\$511,525 	\$0
101029438	January	\$1,238 	\$0
101029438	February	\$3,713 	\$2,475
101033168	January	\$21,465 	\$0
101033168	February	\$51,460 	\$29,995
101034011	January	\$47,524 	\$0
101034011	February	\$48,407 	\$883

```
 0
Utf
3/2/2010 11:44:01 PM
access.queries 6343 articles. 1 followers.

2 Replies
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```Access will need to distinguish which record to use when subtracting so
instead of month you need a DateTime field.
Then try this query --
SELECT Order, OrderDate, [JTD Clm], (SELECT YourTable.[JTD Clm] - [XX].[JTD
Clm] FROM YourTable AS [XX] WHERE YourTable.Order = [XX].Order AND
[XX].OrderDate),"yyyymm")) AS  Variance
FROM YourTable
ORDER BY Order, OrderDate;

--
Build a little, test a little.

"Glenna" wrote:

> I have a query that calculates how much revenue is claimed by month per job
> but then I have to take the new month less the prior month.  The problem is
> the data is in row format.  I don't know how to subtract February from
> January, March from but don't know how. I know how to do it in Excel but not
>
> Example:
> Order	Month	JTD Clm	Variance
> 101026521	January	\$511,525 	\$0
> 101026521	February	\$511,525 	\$0
> 101029438	January	\$1,238 	\$0
> 101029438	February	\$3,713 	\$2,475
> 101033168	January	\$21,465 	\$0
> 101033168	February	\$51,460 	\$29,995
> 101034011	January	\$47,524 	\$0
> 101034011	February	\$48,407 	\$883
>
```
 0
Utf
3/3/2010 12:28:02 AM
```As you don't include the year in a column this suggests that the query only
returns data for one calendar year.  Assuming this to be the case you'll then
have to force the month values to return a true date/time value of the first
of each month to compare them.  Try this, which is based on your current
query, called YourQuery in this example:

SELECT [Order], [Month], [JTD Clm], NZ([JTD Clm] -
(SELECT [JTD Clm]
FROM [YourQuery] AS Q2
WHERE Q2.[Order] = Q1.[Order]
AND CDATE("1 " & [Month]) =
(SELECT MAX(CDATE("1 " & [Month]))
FROM [YourQuery] AS Q3
WHERE Q3.[Order] = Q2.[Order]
AND CDATE("1 " & Q3.[Month]) <
CDATE("1 " & Q2.[Month]))),0)
AS Variance
FROM [YourQuery] As Q1
ORDER BY [Order], CDATE("1 " & [Month]);

Ken Sheridan
Stafford, England

Glenna wrote:
>I have a query that calculates how much revenue is claimed by month per job
>but then I have to take the new month less the prior month.  The problem is
>the data is in row format.  I don't know how to subtract February from
>January, March from but don't know how. I know how to do it in Excel but not
>
>Example:
>Order	Month	JTD Clm	Variance
>101026521	January	\$511,525 	\$0
>101026521	February	\$511,525 	\$0
>101029438	January	\$1,238 	\$0
>101029438	February	\$3,713 	\$2,475
>101033168	January	\$21,465 	\$0
>101033168	February	\$51,460 	\$29,995
>101034011	January	\$47,524 	\$0
>101034011	February	\$48,407 	\$883

--
Message posted via AccessMonster.com
http://www.accessmonster.com/Uwe/Forums.aspx/access-queries/201003/1

```
 0
KenSheridan
3/3/2010 12:32:43 AM

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