I am working on data in Spotfire. The table has 4 columns:
RowID
StudID
IMT
Date
I am trying to insert a calculated column in Spotfire to get the date from the previous row for a specific StudID. The date should not be filled for first entry for a specific StudID since it does not have a previous row.
Please refer to the image for details:
This will be a calculated column using the OVER function, along with Intersect, Previous and the First aggregation.
First([Date]) OVER Intersect(Previous([Date]), [StudID])
It reads: over the intersection between (group of) the previous (to the current row) dates (which are the same) and the Student ID's (the same as the current row), give me the first row of that group. In your example, it will only ever return one date for that group, but the formula needs to be able to handle what happens if there are multiple rows. You may also need to think about whether this will happen in your data and what you're going to do about it. I.e.
StudID Date
124-639 6/12/2018
124-639 6/12/2018
124-639 6/14/2018
Building off of JasonJ's answer, it looks like his solution ran into issues when the dates of different StudIDs overlapped with one another.
So I was seeing something along the lines of this:
StudID, Date, Result
A, 10/1/2014,
A, 10/10/2014, 10/1/2014
A, 10/17/2014, 10/10/2014
B, 10/20/2014,
A, 10/21/2014,
B, 10/22/2014,
B, 10/24/2014, 10/22/2014
I created a weird workaround by adding another Calculated Column.
I doubt this is the IDEAL way to do this (I'd bet there's a better OVER function, but I couldn't identify it right off), but it looks like it's working.
First Calculated Column (Named [CalcRank]):
Rank(Concatenate([StudID],Year([Date]),If(DayOfYear([Date])<10,"0",""),If(DayOfYear([Date])<100,"0",""),DayOfYear([Date])))
Second Calculated Column:
Max([Date]) OVER (Intersect(Previous([CalcRank]),[StudID]))
Please note, you may have to pad your StudID with 0s to make sure it orders properly, like I did with the Date column.
Related
I have a problem with Tableau.
I have a Dataset with some rows and some columns. I want to write a IFELSE structure where
The IF condition is that the Value of special field(fixed by a row and a column) is equal to the header of a column (it is every time equal to one name(header) of the different columns).
So to summarize: one value is every time equal to the name of a column and to find the column shall be the if-structure
Does someone know if there is a function to call the name (header) of a column? I didn't find it
Here is an small example, in which the Calculated_function choose the right price according to the Barcode. Everything in the first raw, is the header_name of the column below. enter image description here
Best regards
Jonas
You can work like this.
I created a sample dataset as given by you
Step-1: Connected With data in tableau. Clicked all columns having price (4 here), pivoted them so that they look like this..
Step_2: Create calculated_field like this
if [Barcode] = [Barcode_c]
then [Price] END
Step3: Filtered out null values from calculatedField and got a view like this which can be tweaked as per liking.
This is the data that comes back from the database
Data Sample for one season (the report returns values for two):
What you can see is groupings, by Season, Theater then Performance number and lastly we have the revenue and ticket columns.
The SSRS Report Has three levels of groupings. Pkg (another ID that groups the below), venue -- the venue column and perf_desc -- the description column linked tot he perf_no.
Looks like this --
What I need to do is take the revenue column (a unique value) for each Performance and return it in a separate column -- so i use this formula.
sum(Max(Fields!perf_tix.Value, "perf_desc"))
This works great, gives me the total unique value for each performance -- and sums them up by the pkg level.
The catch is when i need to pull the data out by season.
I created a separate column looks like this
it's yellow because it's invisible and is referenced elsewhere. But the expression is if the Season value = to the Parameter (passed season value) -- then basically pull the sum of each of the tix values and sum them up. This also works great on the lower line - the line where the grouping exists for pkg -- light blue in my case.
=iif(Fields!season.Value = Parameters!season.Value, Sum(Max(Fields!perf_tix.Value, "perf_desc")), 0)
However, the line above -- the parent/header line its giving me the sum of the two seasons values. Basically adding it all up. This is not what I want and also why is it doing this. The season value is not equal to the passed parameter for the second season value so why is it adding it to the grouped value.
How do I fix this??
Since your aggregate function is inside your IIF function, only the first record in your dataset is being evaluated. If the first one matches the parameter, all records would be included.
This might work:
=IIF(Fields!season.Value = Parameters!season.Value, Sum(Max(Fields!perf_tix.Value, "perf_desc")), 0)
It might be better if your report was also grouping on the Venue, otherwise you count may include all values.
I have a dimension I am showing in a text table that can have one of 3 possibilities "A", "B", or "C" and I want at all times to have A, B and C shown in a text table even if one of them has 0 occurrences. The issue is that I am filtering this based on date, so it is possible that for example B may not exist, but I still want to have a 0 printed for B.
I have gone to Analysis -> Table layout -> show empty rows which will show "B", but in the count display it shows a blank. How can I get it to display a 0?
This problem is very famous among tableau users and I still did not see a generic tableau-only solution. All proper solutions start with injecting rows to your data which I assume you do not want this.
Below method will only work if you have a Date Dimension on the measure and no-data dates are not completely filtered-out; so you will be seeing zeros even though that date has no data as you may see on below screenshot.
When you filter out the no-data dates, unfortunately you will keep on seeing NULLs.
If you are using the SUM of Number of Records as your occurrences, then you may create a calculated field as below and use it in your pane:
ZN(LOOKUP(SUM([Number of Records]),0))
You can leave the Default Table Calculation as Automatic so the Results are computed along Table (accross).
I have a table with 6 columns and 140,000 rows, and I can't figure out how to extract specific information from the table. For instance, when I try to extract all the accidents that happens on a specific date, either it tells me that the row '12/05/2015' does not exist or it doesn't let me set 'Date' as a Row Name since the dates repeat because more than one accident happens in a day, thus giving me the error that 'Duplicate row name: '01/01/2015'.
How can I pick a date and extract all of the data that corresponds to it?
P.S. Below you can see two photos, one of the table and one of the errors I get when trying to set date as a row to make everything clearer.
if I understand correctly your matter, you want to extract from the table, the rows that contain Date1, if so try this :
new_table = table(table(:,1)==Date1,:);
I have two columns of data. Some of the data in the first column repeats (they represent questions). The data in the second column is unique (they represent multiple answers to the same question).
I need to merge all the data in the second column for each unique value in the first column. e.g.:
Q,A
1,yes.
1,is possible.
2,no.
2,not possible.
2,cannot do this.
2,impossible.
3,maybe.
merged to:
Q,A
1,yes.is possible.
2,no.not possible.cannot do this.impossible.
3,maybe.
Something like this is crude but may be adequate:
=IF(A1=A2,C1&B2,B2)
copied down to suit. Then select the last entry (identifiable with something like =A1=A2 copied down to suit) for each Question number.
Questions in column A sorted in order
Answers in column B
In C1 use =B1
In C2 use =if(a2=A1,C1&B2,B2)
Drag down formula in C2.
It will keep adding the lines together as long as the question remains the same. When it gets to a new question, it'll start a new string. The last time each question is listed will be the complete string in column C.
Create a 2 column project in Google Refine
Sort by Q column (if not already sorted) and make sort permanent
Blank Down on Q column to remove duplicate values
On A column, do Edit Cells -> Merge multi-valued cells