Calculation Query

I have a table with three columns

They a Day, MTD performance and Daily change

I am looking to either write a query to calculate difference between two
numbers in a column (similar to say an excel operation) or build an
expression to calculate the difference between these two numbers.

On Mon, 21 Jul 2008 18:58:02 -0700, bengomets
wrote:

I have a table with three columns

They a Day, MTD performance and Daily change

I am looking to either write a query to calculate difference between two
numbers in a column (similar to say an excel operation) or build an
expression to calculate the difference between these two numbers.

Several concerns here! Day is a reserved word (for the builtin Day()
function which returns the day of the month of a date argument); more
seriously, the MTD Performance and Daily Change values appear to be
derived from some more basic (sales??) data, and as such should
probably NOT EXIST in a table, but should instead be calculated
dynamically.

What you can do is create a Query based on your table. In a vacant
Field cell type the expression you want. I'm not sure what the
difference between a MTD value and a Daily Change value *means* - the
previous day's value maybe!? - but

Result: [MTD Performance] - [Daily change]

in a field in a query will give you that difference.

--

John W. Vinson/MVP

"bengomets" wrote:

My apologies but I need to be clearer here.

The table with three columns should be date, MTD performance and Daily Change

Example:

7/1 (Date) 0.50% MTD Performance
7/2 0.90% MTD Performance 0.40% Daily Change

If this were in excel, you would be taking the difference of two cells
within the column.

What I am looking to do, is to write a query, or build an expression that
would enable me to get the daily change for 7/2, based on the Month To Date
performances from 7/2 and 7/1 (Or in other words 7/2 Performance-7/1
performance to get the daily change for 7/2)