Question 2: Express RX S(Full outer join) using a subset of the following relational algebra operations (Project, Select, Rename, Union, Intersection, Set Difference, Cartesian product, Join (conditional or natura)l). Explain your assumptions, if any. We assume that attributes of S is denoted as ATTR(S), attributes of R is denoted as ATTR(R) and (ATTR(R)-ATTR(S) denotes a set of attributes in R that does not belong to S. We also use the notation Mal, a2, a3, .. an (NULL) to denote a relation M with attributes (al, a2, a3, ..an) with one tuple whose values are all null. For example M id, name (NULL) will be Id Name Null Null Question 2: Express RX S(Full outer join) using a subset of the following relational algebra operations (Project, Select, Rename, Union, Intersection, Set Difference, Cartesian product, Join (conditional or natura)l). Explain your assumptions, if any. We assume that attributes of S is denoted as ATTR(S), attributes of R is denoted as ATTR(R) and (ATTR(R)-ATTR(S) denotes a set of attributes in R that does not belong to S. We also use the notation Mal, a2, a3, .. an (NULL) to denote a relation M with attributes (al, a2, a3, ..an) with one tuple whose values are all null. For example M id, name (NULL) will be Id Name Null Null