unwrap(a, wrap_name)
A relation operator.
Removes a nested tuple attr, named wrap_name, unnesting each attr within back into a.
Examples
unwrap
unwrap(wrap($S, {SNO, SNAME, CITY}, sups), sups)| STATUS | SNO | SNAME | CITY |
|---|---|---|---|
| 10 | S2 | Jones | Paris |
| 20 | S1 | Smith | London |
| 20 | S4 | Clark | London |
| 30 | S3 | Blake | Paris |
| 30 | S5 | Adams | Athens |