6. Assume a department table, and an employee table, that have the column names indicated below: employee table eid ename sal deptno hiredate department table deptno dname motto You are given the task: find all employees names and salaries and department names, in departments whose deptno is under 200, that have a motto which is not null. So a typical output line would be smith 50000 sales assuming sales has deptno less than 200 and has a non null motto. Show how to code this task in (a) SQL (b) relational algebra (c) relational calculus