Under What conditions database constraints can be violated? Relational algebra is derived from relational model Considering “dream home case ” as a database write down a relation in notation of...

1. Under What conditions database constraints can be violated?


2. Relational algebra is derived from relational model


3. Considering “dream home case ” as a database write down a relation in notation of relational algebra

Where “get output of all cities where there is both a branch office and at least one property for rent”