Defining Sampling Periods Using A Calculated Field
Jun 6, 2006
We have a db of salmon survey data where catch data is recorded by date, site, etc.
Historically, we have used ‘sampling periods’ to group our results into blocks of time that can be compared from year to year, and within year.
Now, having frequented this forum I’ve read that we shouldn’t store information in tables that can be calculated from fields and I want to try to follow that advice in this instance but am having trouble working this out.
Here’s how we define a sampling period.
1.The start date of the first sampling period in a sampling year is the last Monday in the most recent November.
2.Each sampling period is 14 days long.
What I want to do is have a query use the date of a set to calculate what sampling period the set belongs to. I have an idea that I could use a datediff function to calculate this if I can figure out the ‘last Monday in the previous November’ part. I’ve searched this forum and googled but am having trouble finding anything that I can adapt to this as a query expression.
Anyone care to help a fish bio out? Much obliged :)
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Apr 12, 2006
My query contains two calculated fields [TaxSavings1] and [TaxSavings2], which are based on some currency and number-type fields in one of my underlying tables.
I just created another field in my query which looks like: [TaxSavings1]+[TaxSavings2]. Instead of adding the two fields, it actually lumps the two numbers together. For example, if [TaxSavings1] =135 and [TaxSavings2]=30.25, it will give me: 13530.25. I need it just to simply add, i.e. answer of 165.25.
Does anyone know how to correct this? Thanks in advance.
:confused:
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Nov 1, 2007
HI All
I have a question that I just cant seem to get my head around....so I thought I'd pick your brains!
I have a table that has DriverID, Date, Work, Sleep, Rest. As you can imagine, this records their hours of work, sleep & rest.
Now with new fatigue management laws in Oz, we need to find out if they're working for more than 168 hours in a 14 day period.....
My thoughts are, create a query that runs through every date of the year, then counts forward 2 weeks, sums the WORK hours and only displays anything over 168 hours??? Is this correct? Would that not simply die ? Considering we have about 30 drivers to run through?
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Apr 25, 2006
Hi,
I seem to be stuck on the simplest of tasks with both google and forum searches coming up with information that’s either too simple or too complex for my needs (not time wasted though because I’m learning all kinds of related stuff).
How do I join my tables with one-to-one relationships?
[edit] Doh, got this one now - by indexing without duplicates then saying all in one have to link to one in another:D
How do I define both fields in a linking table as composite or two field primary key?
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Mar 23, 2008
I have this table:
intSalesID (Number, Indexed: (Yes No Duplicates)
intCarID (Number, Indexed: (Yes No Duplicates)
intQuantitySales (Number, Indexed: (No)
This table is a cross table from the two tables tblCars and tblSales where the intSalesID and intCarID are Primary Keys. In this table I didn't set the P.K. I saw databases that have P.K. in tables like this deined from the two fields (intSalesID and intCarID, would be in my case). I wanted to ask what is the difference if I leave this table like this and if I set this two fields to form a P.K.? What is the difference in these twi cases? What do I get and what I don't, if I do either way? Thnx.
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Aug 4, 2005
Hi all - I have a suite of reports which provide customer details. They all require the user to input the name of the customer.
The way it works is that I have a query which returns everything for the customer.
Then I have other queries based on the first query which bring back the specific information I want regarding the customer.
This works fine when the customer's name is entered using [Enter Customer Name] in the criteria of the relavant field in the first query.
However, because a user might want to run several different reports on the same customer it becomes a chore for them ot repeatedly have to enter the customer name.
My solution is to have an unbound field in the reports menu for the customer name and to use this as the criteria in the query, so it now reads [Forms]![FrmMenu]![Text42].
The first query runs fine, but the queries based on it are suddenly not returning any records.
There is undoubtedly a simple explanation for this but as I'm quite dim, I can't see it. Could somebody enlighten me and maybe even suggest a solution?
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Jun 6, 2006
Hello all,
I was wondering what should I define a chechbox as if I want to make it a variable, so that when it is checked (= -1), I can check for the -1 and loop somewhere.
Thanks
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Jun 6, 2006
Hello all,
I was wondering what should I define a chechbox as if I want to make it a variable, so that when it is checked (= -1), I can check for the -1 and loop somewhere.
Thanks
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Jun 6, 2006
Hello all,
I was wondering what should I define a chechbox as if I want to make it a variable, so that when it is checked (= -1), I can check for the -1 and loop somewhere.
Thanks
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Jan 25, 2006
I have read more post than i care to think about but I can't stil get my head round the following problem.
I have created a database (with this forums help) but I am stuck on the following query/form/vba etc....
Our staff holidays run from 01/05/05 until 30/04/06 and i have a query that calculates what holiday entitlement staff are due from 01/05/05 on a daily basis up to 23 days worth of hols ending on 30/04/06, but I can't work out how to set next years holiday period 01/05/06 - 30/04/07 without changing the form manually, is there a way for it to auto update??
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Jul 31, 2005
I am tyrying to get my query to analyse the last three months of data but typing the following in the criteria section under Potting Date
Date()-90
An error is occuring.
Can anybody assist with this problem, I think I am writing the wrong thing
Regards Karen
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Mar 7, 2005
Hi,
I am trying to auto-import data w/ a single-click from several Excel sheets. A sample line:
DoCmd.TransferSpreadsheet acImport, , "tblTS1", filename, True, Product!A1:H100
where
tblTS1 - tbl where I'm putting the data
filename - c: est.xls
Product!A1:H100 - range of data I want in sheet Product
I am having problems w/ the "range" portion of Transferspreadsheet (I know it's this portion, because it works when I pre-name the range in Excel). I have tried all sorts of variations on the syntax:
Product!A1:H100
"Product!A1:H100" or 'Product!A1:H100'
"Product" & ! & "A1" & : "H100"
"'Product'" & ! & "A1" & : "H100"
Product & "!" & A1 & ":" H100
I get the error msg:
The MS Jet database engine could not find the object '$:'. Make sure the object exists and that you spell its name and the path name correctly." or "Syntax error"
I wanted to mistake-proof the data transfer, so I did not want to:
- predefine the range in Excel (under InsertNameDefine)
- have the user enter values in text boxes
Any help w/ the syntax would be greatly appreciated!
Cheers,
dvs :confused:
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Nov 28, 2005
I have a database about when computers have been installed
I have a form
It has a drop down list with Januray through to December
I want the user to select a month and a year and then click the command button and it will run a query displaying all the computers installed in the month of that year
any ideas people?
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Mar 30, 2007
When I run this query, the fields in the new table contains 253 characters. How do I specify in the SQL command that the field Carg2 and Carg3 will contain 3 charachters ?
SELECT dbo_allesc.AccReport, Left([AccReport],2) AS Carg2, Left([AccReport],3) AS Carg3,.........................
INTO regTabell
Thank you, Tor
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Mar 17, 2015
how shall i define my new Date or numbers.Now "yyyyXX" this is my date "y" is year 4 digits and "XX" is my problem 2 digits. I ll give an example,
(XX = 01....36) XX can be max 36 and min 01 of course. f. Exp. 201436 and next number shall be 201501.
the biggest problem is different of these number with basic math 201501-201436= 65 but for me it should be 01... The Question is; How can define these ??
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Jun 18, 2014
Table1 contain Two fields (3Months) and (6Months)
Table2 contain Two fields (3Months) and (6Months)
the table 2 is the source of a form that will let the user change the numbers. table 1 should change Date1 and Date2 Fields based on the two fields (3months) and (6months) if i want to make a lookup wizard it should be changed manually and if i make a calculated field i can't find other tables in the expression builder
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Oct 29, 2006
Hi all!
I want to add a function to a form that filters records from a specific date period.
Each record has a field containing the date the record was added.
Example: I want to show the records added between 15.09.2006 and 10.10.2006.
Furthermore, the “from” and “to date” must be defined in textboxes, and the filter initiated with a button.
I need this functionality on a continuous form and in a report. How do I achieve this?
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May 6, 2014
I have several pieces of equipment that register data every minute, is there a way to do like a 5 minute average
i.e., 00:00 - 00:04, 05:00 - 09:00
NOT 00:00- 05:00, 01:00- 06:00 and so on.
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Nov 2, 2007
Hello Everyone,
I am in need of your vast array of knowledge and experience. I have been fighting with this Access report for a few days now, and I've finally decided to ask for your help.
I am running a report which provides a look at a set of 12 survey results. The 12 items are numerical in nature and are decimals with 2 decimal places. What I am trying to do is have Access automatically highlight the top 3 scores in one color, and the bottom 3 scores in another color.
So what I need is an expression that allows Access to discern the top 3 and bottom 3 from the series of 12 scores. in Excel you can identify the top score with this with the formula "Max(A1:A13)", but seeing as in Access we don't have the cell identifiers, this approach will not work.
I know that I will need to use conditional formatting in order to get the cells to highlight. I also see that there is "Max" and "Min" functions in Access as well, and I attempted to create and expression like this "=Max([field 1] AND [field 2] AND [field 3] AND, etc...)" with no luck. I also tried changing the "AND" to "OR", again without luck.
One thing that I should mention is that the report does contain a lot of other data, so I need to be able to apply whatever the best fix is, to only those 12 fields.
Unfortunately I am not accustomed to using code, and as a result I am unsure of how to input it properly. I am certainly open to code solutions, but I would also need a explanation of how to put it in properly.
The easiest solution for me, if possible, would be an expression that I can enter into the conditional formatting wizard to tell it to highlight the values.
If anyone has any ideas, I would appreciate it. I'll buy you a virtual beer :-)
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Mar 30, 2014
I have to create a control on a form that will be able to change to one of ten colors, some of them are subtle shades. I will be doing this from vba on the control. I know how to do all of this except defining the colors.
I keep seeing the 3 part RGB(xx, xx, xx) etc. but I can't find the values for it that will give me the exact colors that I need!
I also saw a possibility of using a the hex equivalent for the color but I couldn't make that work?
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Jul 23, 2015
I have a query with a Date field for EndDate (the dates for end-of-week, Fridays in our case) and another field for Sales (number of sales, not dollars).I want to add 4 calculated fields that represent weeks and have the Sales appear in the correct column (field) for that date.So I will have columns for 10 July 15, 17 July 15, 24 July 15 and 31 July 15 and I want the Sales for each record to land in the correct date column, based on the EndDate column. (The 4 fields is just for the sake of the example, I will actually be having dozens of these calculated date fields).I tried to do it by setting up the 4 calculated fields like:
10Jul15: Sales
and then adding Criteria like:
EndDate = #10/07/2015#
It doesnt work.
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Jun 10, 2015
I use access 2010.
I am assuming by the error code, one can not use a calculated field to calculate another field.
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Oct 18, 2006
I am new to Access and would be very grateful for some adivce on setting up a query.
The data in the table below comes from a photon counter. Both fields are numbers although TIME actually represents seconds.
I need to be able to group the DATA field by arbitrary TIME periods. e.g. to divide the table up into bins of, say, 8.7 seconds length, showing the total accumulated in the DATA field for each successive period of 8.7 seconds.
The tables are about 300,000 records long.
Any help would be much appreciated.
Thanks,
TIME - DATA
285748175.864557 - 100
285748175.874556 - 100
285748175.884556 - 0
285748175.894557 - 100
285748175.904557 - 0
285748175.914556 - 200
285748175.924556 - 300
285748175.934556 - 0
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Apr 1, 2013
I have some issues with summarizing in a query. My intention is to summarize income and expenses over periods
This is how it should look like.
Periods_____Total income___Total expenses
01-2013_____234__________435
02-2013_____533__________132
03-2013_____345__________853
etc
I made the following query to get the result I wanted.
Unfortunately, the result seems to be multiplied instead of summarized.
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Jan 23, 2014
If my fiscal year ends 12/31 but the pay period doesn't end until 1/10, how do I get a query to tell me there are 25.3 pay periods remaining (counting from the last pay period 1/11)?
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Sep 10, 2007
Hello,
I'm having a hard time trying to figure out how I should go about designing the table structure for the hours tracking for the database I'm working on. Basically, I have a table with projects (tblProj) that I need to track the number of labor hours worked per month. The problem lies in the fact that each project could have varying time periods, anywhere from less than a year to more than a year and can start and end at any time of the year.
I was thinking of creating a second table (tblProjHours) to store the hours for the project but I'm not sure what the most efficient way of doing this would be. My idea was to create a table as follows:
tblProjHours
ProjHoursID (pk)
ProjID (fk)
BeginDate
EndDate
Month1
Month2
Month3, etc....
I would create a large number of fields/columns, something like Month1 to Month36 just to make sure I have enough months to enter in the hours. This is of course inefficient since some projects would be way shorter than the maximum allowed months set by the table structure and there is always the possibility of surpassing the maximum allowed months based on the table structure. I was wondering if someone had any better ideas on how I should pursue the design. Thanks in advance!
TheMach
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