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There's nothing in the relational model that suggests a field (cell) can't take the value of a relation. Only SQL makes that difficult.
by andyferris 1y ago
There's nothing in the relational model that suggests a field (cell) can't take the value of a relation. Only SQL makes that difficult.
- johannes1234321 1y agoThere is nothing forbidding it, but then you can't process it further with the same algebra, that value then is a single opaque value. (Which for many uses is fine as that should be one of the final steps of processing)