Question: What
does the powermultiset_by_cardinality function do in SQL?
Can you show an example using powermultiset_by_cardinality?
Answer: This procedure takes as
input a nested table (and a cardinality) and returns a
nested table of nested tables containing all nonempty
subsets (called sub-multisets) of the nested table of the
specified cardinality.
Here are some examples using the
powermultiset_by_cardinality:
select
*
from
table(powermultiset(sample_ntt('a','b','c','d'))
) ;
select * from
table(powermultiset_by_cardinality(sample_ntt('a','b','c','d')
,2) ) ;
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