Recent questions tagged relational-algebra

Which operation requires two relations as input to form a new relation and these two relations must have a common attribute?(1) Cartesian product operation(2) Division op...

Consider a pair of relations $R_{1}$ and $R_{2}$ having $t_{1}$ and $t_{2}$ number of tuples, respectively. Let us define the semijoin $\left(R_{1} \ltimes R_{2}\right)$ ...

Consider a pair of relations $R_{1}$ and $R_{2}$ having $t_{1}$ and $t_{2}$ number of tuples, respectively. Let us define the semijoin $\left(R_{1} \ltimes R_{2}\right)$ ...

Can you help me understand the last 2 options

Given two relations R1 and R2 where R1 contains N1 tuples and R2 contains N2 tuples, give the minimum and maximum possible sizes (in tuples) for the relation produced by ...