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You can also use a QDR to qualify a relation (which is really a special kind of variable).
Suppose the region
.district
relation is dimensioned by district
. When you qualify district
with the value Seattle
, then the value of the expression is the value of the relation for Seattle
. Because the QDR specifies one value of district
, the expression has a single–cell result.
The definition of region
.district
is as follows.
DEFINE region.district RELATION region <district> LD The region for each district
The following statement displays the value WEST
.
SHOW region.district(district 'Seattle')