SHOW:
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- or go back to the newest paste.
| 1 | foreign(T, U, Attrs) :- | |
| 2 | foreign_claim(T, U, Attrs), | |
| 3 | forall(member(A, Attrs), (attribute(A, T), | |
| 4 | attribute(A, U))), | |
| 5 | T\=U. | |
| 6 | ||
| 7 | foreign_key_path(T, T, []) :- | |
| 8 | table(T). | |
| 9 | ||
| 10 | foreign_key_path(T, U, [foreign(T, U, Attrs)]) :- | |
| 11 | foreign(T, U, Attrs). | |
| 12 | ||
| 13 | foreign_key_path(T, V, [foreign(T, U, Attrs) | Rest]) :- | |
| 14 | foreign(T, U, Attrs), | |
| 15 | foreign_key_path(U, V, Rest). | |
| 16 | ||
| 17 | attribute(custkey, customer). | |
| 18 | attribute(name, customer). | |
| 19 | attribute(address, customer). | |
| 20 | attribute(nationkey, customer). | |
| 21 | attribute(phone, customer). | |
| 22 | attribute(acctbal, customer). | |
| 23 | attribute(mktsegment, customer). | |
| 24 | attribute(comment, customer). | |
| 25 | ||
| 26 | attribute(nationkey, nation). | |
| 27 | attribute(name, nation). | |
| 28 | attribute(regionkey, nation). | |
| 29 | attribute(comment, nation). | |
| 30 | ||
| 31 | attribute(regionkey, region). | |
| 32 | attribute(name, region). | |
| 33 | attribute(comment, region). | |
| 34 | ||
| 35 | key_claim([custkey], customer). | |
| 36 | foreign_claim(customer, nation, [nationkey]). | |
| 37 | - | foreign_claim(nation, region, [regionkey]). |
| 37 | + | foreign_claim(nation, region, [regionkey]). |
| 38 | ||
| 39 | %%%%% | |
| 40 | ||
| 41 | | ?- setof(Z, foreign_key_path(_, _, Z), L). | |
| 42 | setof(Z, foreign_key_path(_, _, Z), L). | |
| 43 | ||
| 44 | L = [[]] ? ; | |
| 45 | ||
| 46 | L = [[foreign(customer,nation,[nationkey])]] ? ; | |
| 47 | ||
| 48 | L = [[foreign(customer,nation,[nationkey]),foreign(nation,region,[regionkey])]] ? ; | |
| 49 | ||
| 50 | L = [[]] ? ; | |
| 51 | ||
| 52 | L = [[foreign(nation,region,[regionkey])]] ? ; | |
| 53 | ||
| 54 | L = [[]] | |
| 55 | ||
| 56 | %%%%% | |
| 57 | ||
| 58 | I want instead a second L being the union of all of the above results. |
