Given the following relational database schema:

Employee=(ID, name, position, officeN, phoneN,age)// assume the name is unique.

Committee =( title, meetingDate, startTime, endTime, location)// You may use <,>,=,!= between dates and times.

Membership= ( ID, title, task) // task = member or chair.

Use a minimum number of operations and tables to express the following queries by SQL statements:

a. List the ID and name of every employee who is not serving on any committee.

b. List the title of every committee on which Sandy Liu or Barry Smith is serving.

c. List the name and position of oldest employees.

d. List the titles of every two committees which do not meet on the same date.

e. List the name and position of every employee who does have phone number.