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A comment on Relational is more than SQL. Parent comment
See Codds original paper (linked in a sibling comment) section 1.4.
Note that the relational algebra developed by Codd does not support querying nested tables, which would make them practically useless.
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See Codds original paper (linked in a sibling comment) section 1.4.
Note that the relational algebra developed by Codd does not support querying nested tables, which would make them practically useless.