4 of 4 people found this helpful
Regarding Number of Record (automatically generated column) is an calculated field which contains value as 1. So it is associated with each of your records. Once you put it in the Rows or columns you will get the number of records in the database.. I basically use the number of records to check the if my data joins are proper or not.
Eg. If you have table A which contains 100 rows and want to join it with the table B. (Joining means adding additional columns to the data.) So after the join if the number of rows are greater than 100 then I need to check my join again. If there is drastically difference after joining the data then using "Number of Records" columns you can identify if the join is wrong.
Suppose you have a social data where you want to get the number post on facebook. Rather than taking count of any of the dimension you can use the "Number of Record".
Let me know if you have any queries.
3 of 3 people found this helpful
So the [number of records] is simply that! and if you look in the field (you'll notice it's a calculated field) and it just contains the number 1. So the SUM of this field is the number of records (rows of data) in the view. This is essentially the 'grain' of the data (what does one row of data represent, so for superstore sales one row represents an Order/Product). The 'grain' of the data (or if in a Viz the Viz Level of Detail, aka VizLoD) is a very important concept in Tableau...here are a couple of blog posts with a bit more detail
Hope that helps.
One way that I am using the Number of Records field is to calculate a homegrown AVG.
There is a field "Sold" with values 'Y' or 'N' and 'Pending' and I want to calculate the average items that have been sold. I am using the following Calculated Measure:
SUM(IF([Sold]="Y") THEN 1 ELSE 0 END) / SUM([Number of Records])