I have a formula from MS Excel 2007 which returns the workweek of a certain date within a certain month.
B1 = IF(AND(WEEKDAY(A2,1)<>1,A2=DATE(YEAR(A2),MONTH(A2),1)),A2-WEEKDAY(A2,1)+7,IF(MONTH(A2)<>MONTH(A2-WEEKDAY(A2,1)+7),EOMONTH(A2,0),A2-WEEKDAY(A2,1)+7))
where A1 = 11/2012 and B1 = 1/7/2012
I'd like to use this formula in MS Access and will return the same value. I'd tried to formulate a query but it won't work.
The field name of column A1 is [rdate] and column B1's field name is [we_date].
Don't calculate, query. See:
Why should I consider using an auxiliary calendar table?
A calendar table can make it much
easier to develop solutions around any
business model which involves dates.
Last I checked, this encompasses
pretty much any business model you can
think of, to some degree. Constant
problems that end up requiring
verbose, complicated and inefficient
methods include the following
questions:
How many business days between x and y?
What are all of the dates between the second Tuesday of March and the first Friday in April?
On what date should I expect this shipment to arrive?
What were the dates of all the Fridays in this quarter?
...
Related
I have a table (Access 2016) tbl_b with date/time registrations
b_customer (num)
b_date (date)
b_start (date/time)
b_end (date/time)
I want to make a chart of all time registrations per day in a selected month and the gaps between those times. For this I need a query or table showing all times as source for the chart. I’m a bit lost how to approach this.
I assume the chart source needs consecutive records with all date and time registrations to do this. My approach would be create a temporary table (tmp) calculating all time periods where the customer is null. The next step would be a union query to combine the tbl_b and tmp table.
The tbl_b does not have records for every day, so I use a query generating all days in the selected month which shall be used in the chart (found this solution here: [Create a List of Dates in Access Query)
The disadvantage of using a tmp table for the “time gaps” is that it is not updating real time, where a query would provide this opportunity. I have about 20 queries to perform the end result, but MS Access keeps giving (expected) errors that the queries are too difficult.
Every query looks for difference between the in the previous query found end time and the next start time. On the other hand this approach has a weaknes as well, I thought 15 steps would be enough (no more than 15 gaps expected), but this is not sure.
Can anyone give me a head start how this can be accomplished by an easier (and actual working) method? Maybe VBA?
Thx!
Art
I'm trying to use data that is labeled by year (2012 - 2016) to calculate CAGR. The data was originally in one column indicating the total population with another column indicating the year. I've isolated the 2012 and 2016 data into two separate columns and am trying to use SQL to calculate the CAGR rate ((data from 2016)/(data from 2012)^(1/4))-1.
Is this the correct way to calculate CAGR/cummulative growth? I've tried simply using the two columns of data but because they are mismatched and have nulls, it doesn't work. Please let me know if you have any ideas.
Compound Annual Growth Rate (CAGR) doesn't really lend itself to what you're trying to do.
Usually this is used when you say, invest $1000 in a fund, and you calculate the annual growth based on the ending value.
Example - if you invest $1000 and in 5 years it's worth $5000:
( 5,000 / 1,000)1/5 - 1 = .37973 = 37.97%
If I was to write that in SQL Server it would be:
SELECT SUM(POWER((5000.0/1000.0),(1.0/5.0))-1.0)
You can replace the 5000 and 1000 to be the specific columns you want to compare, or a range of data you need to compare.
If you elaborate your question I will update this answer.
I have a database that I am trying to filter out by time stamped dates. Since the dates occur over a 15 year time span, I want to filter everything by month (ex all of the january data together). I also have other conditions to filter data, but the logic is getting screwed up when I filter things doing
ex)
where x=y
and id.number=165
and {id.date between UNIX_DATE('01-01-2015') and UNIX_DATE('31-01-2015')
or id.date between UNIX_DATE('01-01-2016') and UNIX_DATE(-31-01-2016')}
I know I can't break it into that braced condition, since it returns an error for me. Is there a way to group the conditions together so the logic is conditionA AND conditionB AND (dateyearA OR dateyearB OR dateyearC or....)?
The ANSI SQL standard provides a way of extracting the month from a date. You should use that:
where x = y and
id.number = 165 and
extract(month from id.date) = 1
That should greatly simplify your code. Not all databases support extract(). Most support either extract() or the month() function. All have this functionality using some function.
Here trip 1 involves 2 activity_code in a single day and also concludes in a single day and most other activities are just single day but i have one trip that span over more than one day.
What could be the best possible way to store date range for that column that span more than one days.
Splitting the column into multiple begin date and end date just doesn't make sense as there would be many blank columns?
trip_id(pk,fk) Activity_code(pk,fk) date
1 a1 1st October 2015
1 a2 1st October 2015
2 a3 2nd -5th October 2015
Keep in mind that i need to search the activity_code on basis of month. such as list all the activity code that occur in October ?
Is it possible to insert a range of date in a single column or any other design solution ?
Is there any datatype that can represent the date range in single value ?
PS: oracle 11g e
Store the date ranges as FirstDate/LastDate or FirstDate/Duration.
This allows you to store the values in the native format for dates. Storing dates as strings is a bad, bad idea, because strings don't have all the built-in functionality provided for native date types.
Don't worry about the additional storage for a second date or duration. In fact, the two columns together are probably smaller than storing the value as a string.
Splitting the date into start date and end date would be ideal. Storing dates as strings is not recommended. If you store your dates as strings then there is a possibility of malformed data being stored in the column since a VARCHAR2 column will allow any value. You will have to build strong validations in your script while inserting the data which is unnecessary.
Secondly, you will not be able to perform simple operations like calculating the duration/length of the trip easily if both the start_date and end_date are stored in the same column. If they are stored in different columns it would be as simple as
SELECT trip_id, activity_code, end_date - start_date FROM trips;
Suppose ,I have a table which has all the billing records. Now I want to see the sales trend for a user given time duration group by each 3 days ...what should be the sql query regarding this?
please help,Otherwise I am gone ...
I can only give a vague suggestion as per the question, however you may want to have a derived column with a standardised date (as per MS date format, just a number per day) that you could then use a modulus (3) on so that days are equal per 3 day period. You can then group and aggregate over this column to get the values for a 3 day period. Obviously to display the date nicely you would have to multiply back and convert your column as well.
Again I'm not sure of the specifics, but I think this general idea could be achieved to get a result (may well not be the best way so it would help to add more to the question...)