cross-product

The relation schema, Person (pid, city), describes the city of residence for every person uniquely identified by pid. The following relational algebra operators are available: sele...

The relation schema, Person ($\underline{\text{pid}}$, $city$), describes the city of residence for every person uniquely identified by $pid$. The following relational algebra oper...

Consider the following three relations in a relational database. Employee ( $$\underline {eld} $$ , Name), Brand ( $$\underline {bld} $$ , bName), Own ( $$\underline {eld} $$ , $$\...

Information about a collection of students is given by the relation studInfo(studId, name, sex) . The relation enroll(studId, courseId) gives which student has enrolled for (or tak...