Introduction to InterSystems DeepSee - InterSystems Documentation

The DeepSee Model
3.7.1 Measures
Measures refer to source data and aggregate it. That is, a given cell in a pivot table corresponds to
specific records in the database. If that cell displays a measure, the measure uses a specific field in
those records and gets all the values of that field (one value in each of the associated records). It then
aggregates those values and displays the result.
DeepSee provides a set of aggregation functions, including sum, minimum and maximum, average,
first date and last date.
Measures can be used only as columns.
3.7.2 Computations
In contrast to measures, computations refer to data in other cells of the pivot table and use that data to
compute a related number.
The expression for a computation uses Caché ObjectScript. A large selection of functions, macros,
and special variables is available, and you can use any Caché ObjectScript expression. For example,
you can create computations that do the following:
• Compute the difference between two columns or two rows
• Compute a cumulative total
• Divide one column by another and display as a percentage
• Use If-Then-Else logic to determine which number to display
• Compute the total value shown in another column or row (or use this total within a more complex
calculation)
Computations can be used as rows or as columns.
3.7.3 Automatically Created Measures and Computations
DeepSee automatically creates the following measures and computations:
• The Count measure is simply a count of the records in the base class (in this case, User.Orders),
automatically aggregated as a sum.
• In addition, a cube automatically provides a measure corresponding to each numeric dimension.
Any such measure is automatically aggregated as a sum.
• The Total computation provides a total. When you use this computation as a row, a given cell
displays the sum of all values in the column, as shown in the example after this list. When you
use this computation as a column, a given cell displays the sum of all values in the row.
22 Introduction to InterSystems DeepSee