Prolog rules and query -


i need find rules and/or query knowledgebase in prolog information costumers in supermarket.

for example have: 

customer(name,age,sex,wage).  customer(john,30,m,2000). customer(mary,35,f,2500). customer(mark,40,m,2500).  invoice(number, costumername, product, price).  invoice(001, john, potatoes, 20). invoice(002, john, tomatoes, 10). invoice(003, mary, soap, 50). invoice(004, mark, potatoes, 20). invoice(005, mary, detergent, 15).  food(potatoes). food(tomatoes). cleanprod(soap). cleanprod(detergent).

if want find trend example, understand female bought more clean products male...which kind or rule , query should use ?

you can use findall followed sort collect unique results of query (you don't want duplicate invoices in list), , length check length of collected results.

for example:

findall(x, (invoice(x, c, p, _), customer(c, _, f, _), cleanprod(p)), xs), sort(xs, invoicesofwomenbuyingcleanproducts), length(invoicesofmenbuyingcleanproducts, n).

also, please note variable start uppercase, , atoms start lower case (also applies predicate names).

if want atom starting upper case, have surround single quotes.

variable: m

atom: 'm'

atom: m

for example, rewrite kb in way:

%   not needed, useful %   documentation of predicate means: % customer(name,age,sex,wage).  customer('john',30,m,2000). customer('mary',35,f,2500). customer('mark',40,m,2500).  % invoice(number, costumername, product, price).  invoice(001, 'john', potatoes, 20). invoice(002, 'john', tomatoes, 10). invoice(003, 'mary', soap, 50). invoice(004, 'mark', potatoes, 20). invoice(005, 'mary', detergent, 15).  food(potatoes). food(tomatoes). cleanprod(soap). cleanprod(detergent).

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