2.6

Consider the employee database of Figure 2.17. Give an expression in the relational algebra to express each of the following queries:
a. Find the name of each employee who lives in city “Miami”.
b. Find the name of each employee whose salary is greater than $100000
c. Find the name of each employee who lives in “Miami” and whose salary is greater than $100000.

1. \(\Pi_{person\_name}(\sigma_{city = "Miami"}(employee))\)
   
2. \(\Pi_{person\_name}(\sigma_{salary > 100000}(employee \bowtie works))\)
   
3. \(\Pi_{person\_name}(\sigma_{salary > 100000 \wedge city = "Miami"}(employee \bowtie works))\)