[sqlite] Closure

As an aside, a principle of the relational model is that operations on
relations should produce a relation. This caused a bit of a problem early on
as if you perform a Project operation ie cut down the number of fields, you
can finish up with 'duplicate' rows ie rows that can't be distinguished.
RDBMs in practice all use tables instead of relations. Even base tables can
contain 'duplicate' records although that would be bad practice. 


 
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