'Unique' Query

Sep 24, 2005

I've been on other forums with this problem but no one can solve my problem.

I've created a database with 3 tables that are linked:

- tbl_customer
- tbl_rates
- tbl_destination

They have the following fields:

tbl_customer
- cust_id
- customer_code
- first_name
- last_name
- company

tbl_rates
- rates_id
- cust_id
- rates_id
- currency
- pre_rate
- cur_rate
- fut_rate
- comment
- eff_from

tbl_destination
- dest_id
- destination
- destination_code

What I've done is created a form based on the tbl_customer table and used tbl_rates as a sub form. tbl_destination is used to populate a combo box that is situated in the sub form.

Each customer has their own rate sheet. Each rate sheet has different destinations and rates. Rates for the same destination are constantly changing. I need to use this spreadsheet to record the history of every change made to the rates of a particular destination. To do this I've just added the same destination with a new rate.

Now, what I want to do is to create a query that will only show the latest entry of a particular entry.

Eg. tbl_rate

Rate_id - Dest_id - currency - pre_rate - cur_rate - comment - eff_from

1 - 1 - £ - 0.01 - 0.03 - increase - 19 Sept 05
2 - 2 - £ - 0.12 - 0.14 - increase - 19 Sept 05
3 - 1 - £ - 0.03 - 0.02 - decrease - 23 Sept 05

I would want the query to show me the following from the above table:

Rate_id - Dest_id - currency - pre_rate - cur_rate - comment - eff_from

2 - 2 - £ - 0.12 - 0.14 - increase - 19 Sept 05
3 - 1 - £ - 0.03 - 0.02 - decrease - 23 Sept 05

Basically, the query should only show the latest entry which involves Dest_id '1' because there were two entries with the same id.

I've been given advice about this issue but none that actually work.

I would be grateful for any help on this matter.

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3. Testing
4. Test Planning and Preparation
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Now, what I want to do is to find the unique instances for each task where 1 or all of the 30 people worked on that task for the quarter. To further illustrate, say for Business Analysis that Mary Smith did Business Analysis in January, February, and March. She performed that task 3 times (1x in each month) but I am only concerned about knowing that she did perform Business Analysis during the quarter (so I'd like to show a 1 instead of 3).

Ideally, if everyone on Team Jones did Business Analysis during the quarter at least one time, I am only concerned about the one instance where they did and the first occurrence of it, not the other occurrences. So if everyone did do Business Analysis for the quarter, my total count should not exceed the count of members on the team (in this case, the 30 people). So the distribution could look like this (I'm just making this up but this is what I'd like to see):

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Feb
Mar
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I don't know if I'm going about this problem correctly. In a nutshell:

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| ID | Type |

Where ID is an alpha-numeric identifier (say a store number), and there are three potential types, plus Null values. For this, we'll assume the three types are Fruit, Vegetable, and Grain (plus Null).

An example dataset might look like:

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0-1
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0-4
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Is that possible?
Sorry for the long bizarre example, but I thought it the easiest way to make the situation clear. I'd really appreciate any suggestions anyone has on dealing with this situation!!
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Code:
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