view(a)
Returns a as a relational expression which can be assigned to a relvar as a dynamic view.
Examples
$S view
high_sup := view($S[STATUS>20]~{CITY})
high_sup| SNO | SNAME | STATUS |
|---|---|---|
| S3 | Blake | 30 |
| S5 | Adams | 30 |
Note: the high_sup view is re-evaluated each time it is referenced, so any underlying changes to $S would be reflected in it.