I want to calculate the clients growth over the time.
So every day i have the total clients per state and per product subscription, and i can calculate the total for every day.
If i want to calculate the growth every day i don't have problems because i use a calculated member with
[Date].CurrentMember-[Date].PrevMember
This works pretty fine, but now i want to calculate the growth on month. So i have to sum all day growths of the month to calculate the month growth, right?
But my problem is that i'm too newbie to MDX and i can't find a way to produce that result (I want to know how many clients i have more or less over the year).
My intuition says that i need to sum all day's growth in the agregate date.
Could you help me?
If your date hierarchy has a month level above the date level (eg. Year-Month-Day), your cube will already have pre-processed this value. I would use ANCESTOR and LAG to get the data for a given day's month:
WITH MEMBER [Date].[YMD].[Current Month] AS
ANCESTOR(
[Date].[YMD].CurrentMember,
[Date].[YMD].[Month Level]
)
MEMBER [Date].[YMD].[Growth this month] AS
(
[Date].[YMD].[Current Month]
-
[Date].[YMD].[Current Month].LAG(1)
)
This will, however, only get the data from a whole-month period.
If what you're after is all the data between a particular day and the same day in the previous month, then PARALLELPERIOD is your go-to function (sidenote: not a goto statement). PARALLELPERIOD(Level, N, Member) will look at the position of Member amongst its siblings, then go to its ancestor at Level, go N members prior to that, and traverse back down to a member in the same relative position as Member.
In other words, it looks up your date in a prior month, year or whatev'.
WITH MEMBER [Date].[YMD].[One Month Ago Today] AS
PARALLELPERIOD(
[Date].[YMD].[Calendar Month],
1,
[Date].[YMD].CurrentMember
)
MEMBER [Date].[YMD].[All data since today last month] AS
(
/* The [Member]:[Member] syntax here is a range */
[Date].[YMD].[One Month Ago Today] : [Date].[YMD].CurrentMember
)
MEMBER [Date].[YMD].[Two Months Ago Today] AS
PARALLELPERIOD(
[Date].[YMD].[Calendar Month],
2,
[Date].[YMD].CurrentMember
)
MEMBER [Date].[YMD].[All data between today last month and today in the previous month] AS
(
[Date].[YMD].[Two Months Ago Today] : [Date].[YMD].[One Month Ago Today]
)
MEMBER [Date].[YMD].[Growth in the last month since the previous month] AS
(
[Date].[YMD].[All data between today last month and today in the previous month]
-
[Date].[YMD].[All data since today last month]
)
Hope this helps.
<3
Related
We have a relative date dimension in our cube that has member values This Year and Last Year as an example.
The user uses this set on columns against sales so they can look at Sales for this year and the same period last year.
The problem comes when they are using the Calendar Date filter to only select values for this month. If the user selects just this month, then the Last Year member disappears.
Is there a way (perhaps with scope statements) that I can tell SSAS: If the user is using these attributes and they select a specific month (or other level), then use ParallelPeriod to implicitly include the same members for the previous year so that they can see the last year sales?
If not, without using calculated members (I have so many measures that I don't want to have to duplicate them), is there a way using dimensions to show a last year value even if the user selects this year in the date dimension?
There are a few options here...
I would just add a new Calculated Member to an existing dimension,i'll add it to a Pseudo-Dimension [Time Period] dimension with something like this:
(i'm pretty sure you need to add it to an existing Hierarchy. I'll assume [Relative Time])
CREATE MEMBER [Time Period].[Relative Time].[Last Year]
AS NULL
, VISIBLE=1;
SCOPE(
DESCENDTS([Time].[YearMonthDate].[Year].MEMBERS,,AFTER)
,[Time Period].[Relative Time].[Last Year]
);
THIS = AGGREGATE(
PARALLELPERIOD(
[Time].[YearMonthDate].[Year]
,1
,[Time].[YearMonthDate].CURRENTMEMBER
)
,[Measures].CURRENTMEMBER
);
END SCOPE;
We want to show current periods sales versus previous period sales.
To show the previous period we make use of a date dimenion table and the following calculation:
CALCULATE(SalesValueGross; DATEADD(Date[Date]; -1; YEAR))
Unfortunately somehow it shows minor (decimal) differences when comparing years.
The difference get's bigger when we slice to months.
Another issue we have is that this calculation does not seem to work when comparing (for example) week 1 - 2015 with week 1 - 2014.
Any help is greatly appreciated!
When I want to get prior calendar year sales, I use the a formula such as the following:
Cal Prior Yr Sales:=if(HASONEVALUE('Sale Date'[Calendar Year]),
Calculate([Total Sales],
PREVIOUSYEAR('Sale Date'[Date])),BLANK())
The HASONEVALUE just ensures that there is only one year selected so it will know the correct previous year to retrieve.
You can make a series of calculations that will let you use one calc that determines what level of the date hierarchy you are in (assuming you have the fields available in your date table). Here is something I've used in the past, with a fiscal calendar that was different from the normal calendar.
First, the base calculations:
Sales Same Week Prior Year:=
CALCULATE([Total Sales],Filter(All('Sale Date'),
'Sale Date'[Week Key] = max('Sale Date'[Same Week Last Year])))
Sales Same Month Prior Year:=CALCULATE([Total Sales], Filter(All('Sale Date'),
'Sale Date'[Month Seq] = max('Sale Date'[Month Seq])-12))
Sales Same Quarter Prior Year:=CALCULATE([Total Sales], Filter(All('Sale Date'),
'Sale Date'[Quarter Seq] = max('Sale Date'[Quarter Seq])-4))
Sales Prior Year:=CALCULATE([Total Sales], Filter(All('Sale Date'),
'Sale Date'[Fiscal Year] = max('Sale Date'[Fiscal Year])-1))
You can hide all of those calculations and then create one last calculation and leave it visible:
Sales Same Period Last Year:=
if(HASONEVALUE('Sale Date'[Week Key]), [Sales Same Week Prior Year],
if(HASONEVALUE('Sale Date'[Month Key]),[Sales Same Month Prior Year],
if(HASONEVALUE('Sale Date'[Quarter Key]),[Sales Same Quarter Prior Year],
if(HASONEVALUE('Sale Date'[Fiscal Year]), [Sales Prior Year], BLANK()))))
You may need to add a couple of calculated fields to your date table to make it work. I have fields for: [Same Week Last Year], [Month Seq], [Quarter Seq]. Same week last year is an integer field that is yyyyww. Month Seq and Quarter Seq are just autoincrementing integers in chronological order that do not repeat.
My formula for same week last year is
=if('Sale Date'[Week Nbr] = 53, (('Sale Date'[Fiscal Year]-1) * 100) + ([Week Nbr]-1),
(('Sale Date'[Fiscal Year]-1) * 100) + ([Week Nbr]))
I did the sequence numbers in my SQL view, which is the source for the date date. As an example, if my date table starts at 1/1/2010, the month seq for Jan 2010 is 1 and the month seq for Jan 2011 is 13. The quarter seq for Q1 2010 is 1 and the quarter seq for Q1 2012 is 9.
http://www.daxpatterns.com/time-patterns/ is a good read for this topic.
I have a cube with a 'sales' measure, where we have the amount of sold units each day. We have a time dimension with 'Year > week > day'.
I need to have the sales for the first and the last day in a period with non empty sales for a calculated field. I tried with OPENINGPERIOD and CLOSINGPERIOD but they return for a week period just Monday and Sunday... the problem is that sometimes Monday is holiday and Sunday is always holiday and I get empty data (we have no sales on holidays)... Here is my example for last day of a period:
WITH
MEMBER
[Measures].[sales end] AS
'((CLOSINGPERIOD([Time.Weeks].[Day],[Time.Weeks].CurrentMember)
, [Measures].[sales]))'
SELECT
{[Measures].[sales], [Measures].[sales end]} ON COLUMNS,
NON EMPTY
({[Time.Weeks].[Week].Members}) ON ROWS
FROM [cubSales]
I need to get the last day with non empty sales in that period... it should be Friday, but if Friday is holiday, it should be Thursday... I mean the last day for the week with a value for the measure sales..
An easy solution could be to just omit holiday days from your time dimension.
Mondrian has no concept of holidays. I would implement my own MDX function with a built-in list of holidays. It's a flexible approach which can be extended to support different holidays from different countries.
Tested on our cube and seems to work ok (just doesn't say anything about holidays!)
SELECT
{
[Measures].[sales]
} ON COLUMNS
,NON EMPTY
Generate
(
[Time.Weeks].MEMBERS
,Tail
(
NonEmpty
(
[Time.Weeks].CurrentMember * [Time.Weeks].[Day].MEMBERS //<<I think .members is generally default but should do the same thing if we are explicit
,[Measures].[sales]
)
)
) ON ROWS
FROM [cubSales];
In my SSAS Cube, I have a measure called [Sales Total]. What I want to do is to create another measure that would give me the lowest sales figure in the last 6 months. I want this to be a moving minimum, calculated as the min of sales of every time period from the present month to 6 months back.
I wrote my MDX statement but it produces an error and I have hard time trying to figure out why. It is something to do with aggregating Date dimension members into a filter aggregate.
When i choose a single month member from the Date hierarchy, it returns the correct value. When I select multiple members from the hierarchy, as seen below, it errors out.
Any kind of help is appreciated.
WITH
MEMBER [Measures].[Min Sales Total Rolling 6 months] as '(MIN([Date].[Fiscal Month Hierarchy].currentmember.lag(6):[Date].[Fiscal Month Hierarchy].currentmember,[Measures].[Sales Total]))'
MEMBER [Date].[Fiscal Month Hierarchy].[FilterAggregate] as
'AGGREGATE({
[Date].[Fiscal Month Hierarchy].[Quarter].&[20141].&[201310],
[Date].[Fiscal Month Hierarchy].[Quarter].&[20141].&[201311],
[Date].[Fiscal Month Hierarchy].[Quarter].&[20141].&[201312],
[Date].[Fiscal Month Hierarchy].[Quarter].&[20142].&[201401],
[Date].[Fiscal Month Hierarchy].[Quarter].&[20142].&[201402],
[Date].[Fiscal Month Hierarchy].[Quarter].&[20142].&[201403],
[Date].[Fiscal Month Hierarchy].[Quarter].&[20143].&[201404],
[Date].[Fiscal Month Hierarchy].[Quarter].&[20143].&[201405],
[Date].[Fiscal Month Hierarchy].[Quarter].&[20143].&[201406],
[Date].[Fiscal Month Hierarchy].[Quarter].&[20144].&[201407]
})'
SELECT {
[Measures].[Min Sales Total Rolling 6 months]} ON AXIS(0)
FROM [My Cube]
WHERE ([Date].[Fiscal Month Hierarchy].[FilterAggregate])
As explained in this blog by one of the SSAS developers already many years ago, multi select does not work with CurrentMember. You should use
MEMBER [Measures].[Min Sales Total Rolling 6 months] as
MIN(Tail(EXISTING [Date].[Fiscal Month Hierarchy].[Fiscal Month Hierarchy].Members).Item(0).Item(0).lag(6)
:
Tail(EXISTING [Date].[Fiscal Month Hierarchy].[Fiscal Month Hierarchy].Members).Item(0).Item(0),
[Measures].[Sales Total])
instead.
EXISTING gets the set of all selected members. This is needed as there is no single CurrentMember. Then Tail gets the set consisting of the last of these members, Item(0).Item(0) converts that single element set to a member.
The following returns the last member in our set of months:
TAIL([Date].[Date - Calendar Month].[Calendar Month],1)
Our cube contains data upto and including yesterday - so if the above is run today it returns the member [July 2013].
I want the Last Completed Month so if run today (4th July) it should return [June 2013].
Not sure if this adds some extra complexity but if the expression is run on the first of a month then the last member in the hierarchy will actually be equal to the Last Complete Month.
So sometime the last completed month is the last member, and sometime it is the next but last member, in the hierarchy [Calendar Month]
Is there a fool-proof way of coding this expression?
You can determine easily if 'now' is the first day of month as following:
IIF( Day(Now()) = 1, ... , ... )
So you can create a calculated member :
with member [Last Completed Month] as
IIF( Day(Now()) = 1,
TAIL([Date].[Date - Calendar Month].[Calendar Month],1)(0),
TAIL([Date].[Date - Calendar Month].[Calendar Month],2)(0)
)
dunno about the [Calendar Month] hierarchy structure, but perhaps using a lastChild and lastChild.prevMember would be more efficient...
[edit] Tail( ... )(n) retrieve the n-th element of the set returned by Tail - this is a shortcut of item(n)
[edit] imagine the month hierarchy is flat under a all member: [Calendar Month].[All].lastChild would do the same as the Tail() and lastChild.prevMember to get the one before the last.