I am trying to create a table where it only counts the attendees one one type of training (rows) if they attended another particular training (column) AFTER the first one. I think I need to recreate a countif function that compares the dates of the trainings, but not sure how to set this up so that it compares the dates of the row trainings and column trainings. Any ideas?
Edit 3/23
Alex, your solution would work if I had different variables for the dates of each type of training. Is there a way to construct this without having to create new variables for each type of training that I want to compare? Put another way, is there a way to refer to the rows and columns of the table in the formula that would compare the dates? So, something like "count if the start date of this column exceeds the start date of this row." (basically, is there something like the Excel index function in Tableau?)
It may help to see how my data is structured -- here is a scrubbed version: https://docs.google.com/spreadsheets/d/1YR1Wz-pfGHhBxDQDGYgmemLGoCK0cSvKOeE8w33ZI3s/edit?usp=sharing
The "table" tab shows the table that I'm trying to create in Tableau.
Define a calculated field for your condition, called say, trained_after, as:
training_b_date > training_a_date
trained_after will be true or false for each data row depending on whether the B training was dated later than the A training
If you want more precise control over the difference between the dates, use the date_diff function. Say date_diff("hour", training_a_date, training_b_date) > 24 to insist upon a short waiting period.
That field may be all you need. You can put trained_after on the filter shelf to filter only to see data rows meeting the condition. Or put it on another shelf to partition the data according to that condition. Or use your field to create other calculated fields.
Realize that if either of your date fields is null, then your calculated field will evaluate to null in that case. Aggregate functions like Sum(), Count() etc ignore null values.
Related
I have the following Power BI table example for an operating expense report that uses a slicer to filter the first column named "Actual". This is to see the operating expenses for one month compared to the budget figures for the year. It also compares the year-to-date and annual figures. How can I create dynamic columns that change based on the slicer selection? These additional columns are not shown in the pic below but included in the last pic. The Budget column below was just created as an example to show what it should look like.
I set up a star schema with several tables shown below. There's only one expense fact table used and the slicer only works for the first column as previously stated but I need all the other columns to use different parameters and adjust based off what's selected in the slicer. The last image is an overview of the info and the parameters for each column. I tried creating new columns with measures for the budget to see if I can get that going but can't figure out how to make it adjust with the slicer selection.
I'm not sure if I should be using separate queries for each column or can this be done using the one expense table. Hope this isn't too confusing. Please let me know if more info is needed.
If I understood what you wanted correctly I think I solved your problem.
I was able to create the following:
I did not use all values since I did not want to type everything, if you provide some test data it is easier to replicate you dashboard.
This matrix (so not table) allows you to filter for Date (if you so desire, you can always show all date's in the matrix) Book and AccountTree.
The way this is done is by putting the address column in the ROWS for the matrix, Putting the Date column in the COLUMNS of the matrix and putting your values (actual, budget, variance) in the values of the matrix.
For the date is used days, since it was easier to type. You can always use weeks, months, quarters or years.
For this to work you have to create the following relationships:
Hope this helps.
If not, please provide test data so it is easier to try and solve your problem.
I'm trying to count days between a date from the column 'completionDate' and today
The table name is 'Incidents (2)'
I have a simuler table called 'incidents' here it's working.
The code:
DaysClosed = DATEDIFF('Incidents (2)'[completionDate].[Dag];TODAY();DAY)
The error i get:
'A single value for variaton 'Dag' for column 'completionDate' in table 'Incidents (2)' cannot be determined. This can happen when a measure formula refers to a column that contains many values without specifying an aggregation such as min, max, count, or sum to get a single result.'
The error you get strongly depends on how you are evaluating your formula, that's why it might work on another table but not on this one. As #JBfreefolks pointed out correctly you are specifying a column where a scalar value is expected. That can work depending on the context you are evaluating your formula over (assuming it is a measure).
For instance, imagine a data-set with 100 rows equally divided into four categories A,B,C,D. When you create a table visual with a row for each category, each row will have 25 underlying records that will be used in any calculation added to this row (either a measure or an aggregate of any value). This means that when using a formula like datediff with a column reference, it will get 25 values for it's second argument where it expects one.
There are several ways to solve the problem depending on your desired result.
Use a measure like MAX like #JBfreefolks suggested to make sure that a single value is selected from multiple values. The measure will still be calculated over a group of records but will summarize it by taking the maximum date.
Make sure the visual you are using has something like an ID in there so it doesn't group, it displays row context. Any measure added to this visual will evaluate in row context as well.
Use a calculated column instead. They are always evaluated in row context first and their values can be aggregated in a visual later on. When using TODAY() , you probably need to refresh your report at least every day to keep the column up to date.
A more complicated way is to use an iterator like SUMX() or AVERAGEX() to force row context evaluation inside of a measure.
Good to see you solved it already, still posting as it might be helpful to others.
'Incidents (2)'[completionDate].[Dag] referencing a colomn. It is in your computation returning a table (multiple date in the evaluation context) instade of a scalar needed in DATEDIFF calculation.
You need to leverage to be sure that 'Incidents (2)'[completionDate].[Dag] is rturning a scalar value. To do that you can leverage rowcontext and then also formula like Max.
I have a data table connected to multiple lookup tables, and I'm trying to find a way to use a the RELATED function to fetch values from a dynamically-selected lookup table based on the values of one of the columns.
e.g.
If the Month column's value is "2018_01", the Type column's value is "Adjustment", and the Variant column's value is "B", look in '2018_01_Adjustment'[Var_B] (essentially '<Month>_<Type>'[Var_<variant>]).
I was hoping DAX had some parallel to Excel's INDIRECT, but from looking through the internet, it appears it doesn't, so I need an alternative.
The most important thing using DAX is your data model.
For this type of question you need to model your data as thus:
First, do you have a date dimension? Once both the fact table (I think that's what you mean when you write "data table") have a link to the dimension table, you can link and group by the dimension you want, for example the MONTH or the YEAR.
Using PowerBI desktop, I have created a small table (called TimeSelector), with three elements: Day, Week and Month
The idea is to use the content of this table to create a slicer with three options
Thus, selecting one of those options should change the way dates are used in tables.
For instance, selecting Day would result in the following table:
While selecting Week would result in this:
Etc..
I have tried to write a new measure taking in account the selected slicer element, but it is not working:
DayWeekMonthSelection = IF(CONTAINS(TimeSelector;TimeSelector[DayWeekMonth];"Month");
MONTH(VALUES('uptime_downtime'[Uptime_date])))
This is only the first part of the formula, only testing the month option as a start.
Any idea on how to do this?
To offer another perspective:
The approach I take with this is to have a separate table in the database - containing meta data about the date, called date_lookup.
2 of the fields in this table are FirstDateOfMonth & FirstDateOfWeek.
Some of the other fields are lastDateOfMonth & LastDateOfWeek, also DayOfWeek.
By using these fields I can easily present visuals that are grouped by month or week.
Sure you can use functions to get this information, but functions can be platform dependant. If you're making a join to the date_lookup anyway - it's no more effort to get this info from there...
The main reason we need to store this meta data is our company Financial year is Jul - Jun. Therefore we need to have available the Correct FY - which is stored as a field in the date_lookup table. I also have fields in there identifying public holidays...
This is an interesting question, but I'm not sure how to do exactly what you are asking for, so I'll suggest an alternative. (Changing a measure based on a slicer selection isn't too difficult, but I'm not sure a good way to swap out a field/dimension.)
Instead of creating a separate table for your slicers, a different possible approach would be to create a date hierarchy. Often when you drag a date column into the rows or columns box it will automatically create a date hierarchy with Year/Quarter/Month/Date, but since you want week and not quarter, let's create one manually.
First, create a couple calculated columns for week and month. For example:
Month = FORMAT(uptime_downtime[Date], "mmm")
Week = WEEKNUM(uptime_downtime[Date])
Now right-click on the date on the fields, and choose New Hierarchy. It should look like this now:
Now drag the Month and Week columns onto Date Hierarchy and then rearrange them in the appropriate order:
Now you can use that hierarchy in a matrix and use the drill up and down buttons
to get the different groupings:
I am trying to create something that will populate the day of the week in one cell based on a date entered in another, BUT in Master Data Services. I know I will need to do this in a business rule and apply it to the attributes. I am wondering if this can be don using REGEX patterns or any other clever method. So, for example if I have a column with 12/21/2016 in it, I want the next column to say "Wednesday". Thanks!
The simplest way would be using sql and use a calculated column or directly in a view. I'm not that familiar with MDS so there might be a better solution (or not even possible).
alter table mytable add weekday as DATENAME(dw,fieldname) persisted
Do never try to do your own date/time functions, you will fail