Set difference: setdiff

Syntax

setdiff ( ds1, ds2 )

Input parameters

ds1	the first Data Set in the difference (the minuend)
ds2	the second Data Set in the difference (the subtrahend)

Examples of valid syntaxes

setdiff (ds2, ds3)

Semantics for scalar operations

This operator cannot be applied to scalar values.

Input parameters type

ds1, ds2

dataset

Result type

result

dataset

Additional Constraints

The operand Data Sets have the same Identifier, Measure and Attribute Components.

Behavior

The operator implements the set difference of functions (i.e. Data Sets), interpreting the Data Points of the input Data Sets as the elements belonging to the operand sets, the minuend and the subtrahend, respectively. The operator returns one single Data Set, with the same Identifier, Measure and Attribute Components as the operand Data Sets, containing the Data Points that appear in the first Data Set but not in the second. In other words, for setdiff (ds1, ds2), the resulting Dataset contains all the data points Data Point dp1 of the operand ds1, such that there is no Data Point dp2 of ds2 having the same values for homonym Identifier Components.

The operator has the typical behaviour of the “Behaviour of the Set operators” (see the section “Typical behaviours of the ML Operators”).

The automatic Attribute propagation is not applied.