ANSWER THE QUESTION

A database can be represented in Prolog as a set of facts. For example, a database about families can be represented so that each family is described by one clause. As the number of children varies from Jfamily to family the children are represented by a list that can accommodate any number of items. Each person is, in turn, represented by a structure of four components: name, surname, date of hirth, job. The job information is \"unemployed", or it contains the name of the organization and the salary. For instance: familyt person(tom, fox, date(7,may, 1950), works(bbc,15200)), person( ann, fox, date(9,may, 1951), unemployed), [ person(pat, fox, date(5,may, 1973),unemployed), person(jim, fox, date(S,may.1973), unemployed) ] ). Write queries to find the following from the family database: (a) names of families without children; (b) all employed children; (c) names of families with employed wives and unemployed husbands; (d) all the children whose parents differ in age by at least 15 years