join

Consider a relational database schema with two relations $R(P, Q)$ and $S(X, Y)$. Let $E=\{\langle u\rangle \mid \exists v \exists w\langle u, v\rangle \in R \wedge\langle v, w\ran...

Consider the following database tables of a sports league. player (pid,pname, age) coach (cid,cname) team (tid, tname,city,cid) members (pid, tid) An instance of the table and an S...

Consider the following relational schema: Students ($$\mathrm{\underline {rollno:integer}}$$, name: string, age: integer, cgpa: real) Courses ($$\mathrm{\underline {courseno:intege...

Consider the following two relations, R(A,B) and S(A,C): The total number of tuples obtained by evaluating the following expression $\sigma_{B<C}(R \bowtie_{R.A=S.A} S)$ is _______...

Given the following schema: employees(emp-id, first-name, last-name, hire-date, dept-id, salary) departments(dept-id, dept-name, manager-id, location-id) You want to display the la...

Consider the join of a relation R with a relation S. If R has m tuples and S has n tuples then the maximum and minimum sizes of the join respectively are

Consider the set of relations EMP (Employee-no, Dept-no, Employee-name, Salary) DEPT (Dept-no, Dept-name, Location) Write an SQL query to: (a) Find all employee names who work in d...