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datalog 2020-03-25
stuartrexking 2020-03-25T03:57:36.000200Z
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stuartrexking 2020-03-25T04:01:51.003300Z
In this example from the http://learndatalogtoday.org website
[:find ?name-1 ?name-2
:where
[?p1 :person/name ?name-1]
[?p2 :person/name ?name-2]
[?p1 :person/born ?born-1]
[?p2 :person/born ?born-2]
[(.getMonth ?born-1) ?m] ;assigned here
[(.getMonth ?born-2) ?m] ;re-assigned here? filtered? What's going on?
[(.getDate ?born-1) ?d]
[(.getDate ?born-2) ?d]
[(< ?name-1 ?name-2)]]
Try not to think of it as assignment. Instead think of it as a set of constraints: (.getMonth ?born-1) and (.getMonth born-2) must return the same value for every pair of people in the result set.
stuartrexking 2020-03-25T20:54:58.003800Z
@zane Thank you!
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