08/02/2014

[TIBCO Spotfire] Filter only unique values in data to display

When configuring a data source, you have multiple options to limit the data in the display visualization. One of those is Limit data using expression, which allows you to write simple expressions that will always be evaluated, regardless of the filters the user may set.

One thing it's possible to accomplish this way, is the equivalent of the SQL statement:

SELECT DISTINCT(column1, ..., columnN) FROM mytable

to only display tuples with the same values in the specified columns once, regardless of any other different values they may have in other columns.

In Spotfire, you can do this with the Rank function:

Rank(Rowid(), "Asc", [column1], ..., [columnN]) = 1

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