Help With Grouping Items And Calculating Averages

Oct 28, 2007

Simple query for the right person!!!

Hi Guys,

Im in need of some help with a query that i am trying to set up. I have a table with data shown roughly below. And need to extract the average [call length] for each heading of [Call type] on a given date.

Ie. The query will be run and the date can be inputted. It would the display each category only once and the average of that category.

Call type |Call Length (Shown in Minutes)|Submitdate
Split Billing | 4 |27/10/07
Split Billing | 8 |27/10/07
Split Billing | 9 |27/10/07
Split Billing | 1 |27/10/07
Split Billing | 4 |27/10/07
Tariff changes | 2 |27/10/07
Tariff changes | 3 |27/10/07
Tariff changes | 8 |27/10/07
Tariff changes | 5 |27/10/07
Tariff changes | 5 |27/10/07
Billing Cycle | 1 |26/10/07
Billing Cycle | 2 |26/10/07
Billing Cycle | 3 |28/10/07
Billing Cycle | 20 |26/10/07
Billing Cycle | 15 |27/10/07

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I have a database containing values in 16 fields. the fields are filled in over a period of three years. I would like to be able to calculate the average of the last four values entered, regardless of when in the cycle the value is required. I have tryed to use quereies but connot find away to assign the four fields to the expression so that it is the last four values and if four don't exist, avearage what values there are.

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Code:
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Is there a way to make this work?

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Hi,

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Right, So i've got a table which has records for the Top 40 Music Charts.

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http://www.playfm.orcon.net.nz/Chart4.GIF

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Sep 18, 2007

Hi there,

once again I have a problem for which I am looking for some hints...

I still have one table, called tblTransactions, which contains security market transactions. For each buy and sell order, respectively it contains one data set with columns Date, Ticker (i.e. the unique identifier of each security), Quantity (positive for buy, negative for sell orders) and Price (at which the trade was executed).

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SELECT T.Ticker, max(T.Date) AS SellDate
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Now it becomes complicated: What I am looking for is a sub-query, which I want to add to the code above and which gives me the weighted average price at which the stocks were bought and sold, respectively if there have been more than one buy or sell transaction.

That is, for the following sample data of tblTransactions...

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01/01/07 --- AAA --- 50 --- $50
01/01/07 --- BBB --- 25 --- $75
01/10/07 --- BBB --- 75 --- $100
01/15/07 --- AAA --- 30 --- $60
01/20/07 --- BBB --- -100 --- $100
01/25/07 --- AAA --- -40 --- $120
01/26/07 --- AAA --- -40 --- $100

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AAA --- 01/26/07 --- $53.75 1) --- $110.00 3)
BBB --- 01/20/07 --- $93.75 2) --- $100.00

Notes / how to calculate the weighted averages:
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2) (25*$75 + 75*$100) / 100 = $93.75
3) (40*$120 + 40*$100) / 80 = $110.00

I do not have any clue at all how to solve that problem. I would be very happy for any hint that could lead to the right direction.

Best regards
JapanFreak

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