Set operations such as union/intersection.
Set operations such as union/intersection.
(difference s1)
(difference s1 s2)
(difference s1 s2 & sets)
Return a set that is the first set without elements of the remaining sets
Return a set that is the first set without elements of the remaining sets
(index xrel ks)
Returns a map of the distinct values of ks in the xrel mapped to a set of the maps in xrel with the corresponding values of ks.
Returns a map of the distinct values of ks in the xrel mapped to a set of the maps in xrel with the corresponding values of ks.
(intersection s1)
(intersection s1 s2)
(intersection s1 s2 & sets)
Return a set that is the intersection of the input sets
Return a set that is the intersection of the input sets
(join xrel yrel)
(join xrel yrel km)
When passed 2 rels, returns the rel corresponding to the natural join. When passed an additional keymap, joins on the corresponding keys.
When passed 2 rels, returns the rel corresponding to the natural join. When passed an additional keymap, joins on the corresponding keys.
(map-invert m)
Returns the map with the vals mapped to the keys.
Returns the map with the vals mapped to the keys.
(project xrel ks)
Returns a rel of the elements of xrel with only the keys in ks
Returns a rel of the elements of xrel with only the keys in ks
(rename xrel kmap)
Returns a rel of the maps in xrel with the keys in kmap renamed to the vals in kmap
Returns a rel of the maps in xrel with the keys in kmap renamed to the vals in kmap
(rename-keys map kmap)
Returns the map with the keys in kmap renamed to the vals in kmap
Returns the map with the keys in kmap renamed to the vals in kmap
(select pred xset)
Returns a set of the elements for which pred is true
Returns a set of the elements for which pred is true
(subset? set1 set2)
Is set1 a subset of set2?
Is set1 a subset of set2?
(superset? set1 set2)
Is set1 a superset of set2?
Is set1 a superset of set2?
(union)
(union s1)
(union s1 s2)
(union s1 s2 & sets)
Return a set that is the union of the input sets
Return a set that is the union of the input sets
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