Computers and Technology, 09.05.2021 02:10, kendall984
Consider the following relational database that stores information about bars and customers: Drinker (name, address) Bar (name, address) Beer (name, brewer) Frequents (drinker, bar, times a week) Likes (drinker, beer) Serves (bar, beer, price) Write the following queries in relational algebra: 1. Find all drinkers who frequent only those bars that serve some beers they like. 2. Find all drinkers who frequent every bar that serves some beers they like.3. Find those drinkers who enjoy exactly the same set of beers as Amy.Ψβ
Answers: 3
Computers and Technology, 23.06.2019 00:40, QueenKy6050
Consider the following statements: struct nametype{string first; string last; }; struct coursetype{string name; int callnum; int credits; char grade; }; struct studenttype{nametype name; double gpa; coursetype course; }; studenttype student; studenttype classlist[100]; coursetype course; nametype name; mark the following statements as valid or invalid. if a statement is invalid, explain why. a.) student. course. callnum = "csc230"; b.) cin > > student. name; c.) classlist[0] = name; d.) classlist[1].gpa = 3.45; e.) name = classlist[15].name; f.) student. name = name; g.) cout < < classlist[10] < < endl; h.) for (int j = 0; j < 100; j++)classlist[j].name = name; i.) classlist. course. credits = 3; j.) course = studenttype. course;
Answers: 1
Consider the following relational database that stores information about bars and customers: Drinker...
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