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SQL query to return a new generated column based on another column

Posted on 2007-03-29
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I have an table in an Access database with three columns:

File
Date
Amount

If I would like to retrieve the sum of the amounts for each file, from 1st of October to 1st of November 2006, I would write an SQL query like this:

SELECT File, SUM(Amount) AS Total FROM Table1 WHERE ([Date] >= #01/10/2006#) AND ([Date] < #01/11/2007) GROUP BY File

Now, what if I wanted to return three columns instead of two. The first two columns would be lthe same as above (File and Total), and the third column would be another total - the sum of all Amounts from 1st of October 2005 to 1st November 2005.
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Question by:SETP
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TheSloath earned 2000 total points
ID: 18815120
Adjust the query you have so that one of the columns is the period, e.g.:

SELECT IIf(Month([Date]) IN (10,11,12), Year([Date]), Year([Date]) - 1) As YearStart, File, SUM(Amount) AS Total FROM Table1 WHERE ([Date] >= #01/10/2006#) AND ([Date] < #01/11/2007) GROUP BY File

Then create a crosstab query based on that query, with the YearStart as the column headers: just choose the 'FIRST' Total for the Value column.
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